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4 WebCGM Profile

4.1 WebCGM Proforma

The following profile proforma (PPF) defines the WebCGM application profile for CGM files with a comparison to the ISO Model Profile as defined in ISO/IEC 8632:1992 Amd.1:1994. The tables for the ISO Model Profile are duplicacted here for reference and are intended to be accurate. In case of discrepancies, the Model Profile in ISO/IEC 8632:1992 Amd.1 shall take precedence. In the PPF, you will see references such as 7.5.4.5, 5.5.11, and Annex H, etc. These are references to sections of the CGM:1992 text and to Amendment 1, "Rules for Profiles", from which this proforma is extracted. Other internal PPF references look like T16.13 and Attachement 26.4, which are references to table entries in the PPF itself.

4.2 Metafile Rules

Functionality

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.13.1

Same as Model Profile: No

 

Encodings

Select 1 or more encodings:

Binary Yes; Character No; Clear text No;

Select 1 or more encodings:

Binary Yes; Character Yes; Clear text Yes;

T.13.2

Same as Model Profile: Yes

 

Number of pictures

Number of pictures permitted in a metafile:

minimum (>=0)? 1.

maximum (>=0 or no limit)? No limit.

Other: None.

T.13.3

Same as Model Profile: Yes

 

Empty pictures

Are pictures allowed which have no graphical primitives?

(yes/no) Yes.

Other: None.

T.13.4

Same as Model Profile: Yes

 

Metafile size

Any restrictions on metafile size? None.

Other: None.

4.3 Multi-element Rules

Functionality

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.14.1

Same as Model Profile: No

 

Colour

References:

7.5.4.1

Select which rule applies to each metafile (choose 1):

Either all colours or none shall be defined. Yes;

All colours shall be defined. No;

No colours shall be defined. No;

Are colour indexes allowed to be redefined within a picture or metafile? (yes/no) Yes.

Any restrictions on the number of distinct colours used within a picture or metafile? (Monochrome metafiles shall use at most two distinct colours.) None.

Are conformance categories defined? (yes/no) Yes.

If yes, specify.

Monochrome and colour.

Other: Greyscale is considered to be a special class of colour.

Select which rule applies to each metafile (choose 1):

Either all colours or none shall be defined. Yes;

All colours shall be defined. No;

No colours shall be defined. No;

Are colour indexes allowed to be redefined within a picture or metafile? (yes/no) No.

Any restrictions on the number of distinct colours used within a picture or metafile? (Monochrome metafiles shall use at most two distinct colours.) None.

Are conformance categories defined? (yes/no) Yes.

If yes, specify. 3 categories: monochrome, greyscale, and colour.

Other: None.

T.14.2

Same as Model Profile: Yes

 

Line primitives -geometric degeneracies

References:

7.5.4.3

Geometric degeneracies are: Permitted Yes; Prohibited No;

If permitted, graphical meaning of the degeneracy: A line primitive element, whose entire locus is a single point, denotes a graphical dot which is a filled circle, with diameter equal to the current line width and colour equal to the current line colour.

Other: None.

T.14.3

Same as Model Profile: Yes

 

Filled area primitives -

geometric degeneracies

References:

7.5.4.4

Geometric degeneracies are: Permitted Yes; Prohibited No;

If permitted, graphical meaning of the degeneracy: A filled-area primitive element, whose entire locus is either a single point or a line has the following meaning:

- If the locus of a filled-area primitive is a single point, then the meaning is a dot (which is a filled circle).

- If the locus of a filled-area primitive is a non-degenerate line segment, then the meaning is a line.

The dot or line is displayed with the fill colour if EDGE VISIBILITY is 'off', unless INTERIOR STYLE is 'empty', in which case it is not rendered. If EDGE VISIBILITY is 'on', the interior treatment is the dot or line displayed in the fill colour, and then a dot or line superimposed with the current edge attributes.

Other: None.

T.14.4

Same as Model Profile: No

 

Graphical text strings

References:

7.5.4.5

Minimum string length (bytes): 0

Maximum string length (bytes): 254

Any restrictions on the use of ISO/IEC 2022 switching controls?

The C0 character NUL (code value) is permitted and has no effect. String parameters of graphical text shall contain no control character (7/8 bit codes: 1-31 and 128-159). ISO/IEC 2022 switching is not allowed in graphical text. A valid WebCGM metafile may use for graphical text: only the character sets: the collection of four character sets which comprise ISO Latin1 and Symbol (see CHARACTER SET LIST); Unicode UTF-8; and UTF-16.

Other: None.

Minimum string length (bytes): 0.

Maximum string length (bytes): 254.

Any restrictions on the use of ISO/IEC 2022 switching controls? Any character set used in the metafile which is accessed by ISO/IEC 2022 switching techniques shall be in the Character Set List (defined in this profile).

Other: None.

T.14.5

Same as Model Profile: No

 

Non-graphical text strings

References:

7.5.4.6

Maximum string length (bytes):

for type SF: 254

for type SF within type D: 1024

Format effectors and ESC: Permitted Yes; Prohibited No;

Other C0 control codes (except NUL and ISO/IEC 2022 switching) are prohibited.

Any limits on the set of acceptable character sets? The permitted character sets for non-graphical text are ISO Latin 1, LHS, and UNICODE UTF-8, and Unicode UTF-16. Only one of these three shall be used throughout any particular WebCGM metaflie instance. According to the CGM standard, the default SF character set, at the beginning of the 'metafile id' parameter of the BEGIN METAFILE element is ISO Latin 1. If the metafile is to use UTF-8 for SF parameters, then the following 4-octet ISO 2022 sequence shall occur as the first 4 octets of the 'metafile id' parameter:

ESC 2/5 2/15 4/9

If the metafile is to use UTF-16 for SF parameters, then the following 4-octet ISO 2022 sequence shall occur as the first 4 octets of the 'metafile id' parameter: ESC 2/5 2/15 4/12

Otherwise, the use of ISO 2022 switching is prohibited in non-graphical text string.

NOTE: Section 4.3.4.5 of CGM:1992 is modified by a Defect Resolution in the responsible ISO committee, to allow the switching to UTF-8 (variable length multi-byte), and to allow the use of 8-bit access to the ISO Latin 1 set.

Any restrictions on the use of ISO/IEC 2022 switching controls?

Any character set used in the metafile which is accessed by ISO/IEC 2022 switching techniques shall be in the character set list (defined in this profile).

Other: Non-graphical text strings are considered to be case insensitive.

Maximum string length (bytes):

for type SF: 254.

for type SF within type D: 1024.

Format effectors and ESC: Permitted Yes; Prohibited No;

Other C0 control codes (except NUL and ISO/IEC 2022 switching) are prohibited.

Any limits on the set of acceptable character sets? The permitted character sets are ISO 8859-1 LHS No.1 and ISO 8859-1 RHS No.1.

Any restrictions on the use of ISO/IEC 2022 switching controls?

Any character set used in the metafile which is accessed by ISO/IEC 2022 switching techniques shall be in the character set list (defined in this profile).

Other: None.

T.14.6

Same as Model Profile: Yes

 

Data record strings

References:

7.5.4.7

Maximum string length (bytes) or state "no limit": 32767.

SDR-coding techniques must be used (see annex C.2.2).

Other: None.

4.4 Delimiter Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.15.1

Same as Model Profile: Yes

 

BEGIN METAFILE

END METAFILE

[v1]

References:

5.2.1

5.2.2

7.5.4.6

T.14.5

Element is: Required Yes;

The metafile identifier shall follow the rules for non-graphical text, clause 7.5.4.6 and T.14.5.

Other: None.

T.15.2

Same as Model Profile: No

 

BEGIN PICTURE

BEGIN PICTURE BODY

END PICTURE

[v1]

References:

5.2.3

5.2.4

5.2.5

7.5.4.6

T.14.5

Element is: Required Yes;

The picture identifier shall follow the rules for non-graphical text, clause 7.5.4.6 and T.14.5.

Number of occurrences of these elements allowed in the metafile: No limit.

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

The picture identifier shall follow the rules for non-graphical text, clause 7.5.4.6 and T.14.5.

Number of occurrences of these elements allowed in the metafile: No limit.

Other: None.

T.15.3

Same as Model Profile: No

 

BEGIN SEGMENT

END SEGMENT

[v2]

References:

5.2.6

5.2.7

Element is: Required No; Permitted No; Prohibited Yes;

Maximum number of simultaneously defined segments (both global and local) at any point in the metafile:

Any limits on the number of elements or restrictions on which elements compose a segment?

Is there any meaning given to the segment identifier parameter? (yes/no)

If yes, specify. (Meaning shall have no graphical effect.)

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of simultaneously defined segments (both global and local) at any point in the metafile: 1024.

Any limits on the number of elements or restrictions on which elements compose a segment? None.

Is there any meaning given to the segment identifier parameter? (yes/no) No.

If yes, specify. (Meaning shall have no graphical effect).

Other: When global segments are specified in the Metafile Descriptor, all global segment definitions shall follow all other Metafile Descriptor elements. When segments are specified in the Picture Descriptor, all such segment definitions shall follow all other Picture Descriptor elements.

T.15.4

Same as Model Profile: Yes

 

BEGIN FIGURE

END FIGURE

[v2]

References:

5.2.8

5.2.9

Element is: Required No; Permitted Yes; Prohibited No;

Limits on the number of elements or restrictions on which elements comprise a figure definition: Maximum number of elements = 128. No restrictions on which eligible elements may be included.

Other: None.

T.15.5

Same as Model Profile: No

 

BEGIN PROTECTION REGION

END PROTECTION REGION

[v3]

References:

5.2.10

5.2.11

Element is: Required No; Permitted No; Prohibited Yes;

Maximum number of simultaneously defined protection regions:

Maximum number of elements within each protection region:

Is there any meaning to the region index parameter other than as a unique identifier for each protection region? (yes/no)

If yes, specify. (Meaning shall have no graphical effect).

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of simultaneously defined protection regions: 32.

Maximum number of elements within each protection region: 128.

Is there any meaning to the region index parameter other than as a unique identifier for each protection region? (yes/no) No.

If yes, specify. (Meaning shall have no graphical effect).

Other: None.

T.15.6

Same as Model Profile: Yes

 

BEGIN COMPOUND LINE

END COMPOUND LINE

[v3]

References:

5.2.12

5.2.13

Element is: Required No; Permitted Yes; Prohibited No;

Limits on the number of elements and identity of elements comprising a path definition: Maximum number of elements is 128. No restrictions on which eligible elements may be included.

Other: None.

T.15.7

Same as Model Profile: No

 

BEGIN COMPOUND TEXT PATH

END COMPOUND TEXT PATH

[v3]

References:

5.2.14

5.2.15

Element is: Required No; Permitted No; Prohibited Yes;

Limits on the number and identity of elements comprising a path definition:

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Limits on the number and identity of elements comprising a path definition: Maximum number of elements is 128. No restrictions on which eligible elements may be included.

Other: None.

T.15.8

Same as Model Profile: No

 

BEGIN TILE ARRAY

END TILE ARRAY

[v3]

References:

5.2.16

5.2.17

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of tiles in path direction: 64

Maximum number of tiles in line direction: 64

Maximum number of cells/tile in path direction: 1024

Maximum number of cells/tile in line direction: 1024

Limits on pel path: shall be 0.

Limits on line progression: None.

Limits on image offset: None.

Other: Two types of raster images are allowed. A single (non-tiled) image has a maximum of 67,320,000 cells (11×17 scanned at 600dpi). A non-tiled image may exceed the 1024 cells/tile restriction specified for the tiled images. Tiled raster images are limited 64X64 tiles which are a maximum of 1024×1024 cells each. These tiled images are limited to a total of 250 million cells (adjustment of maximum number of tiles and cells per tile are necessary to meet this requirement).

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of tiles in path direction: 16.

Maximum number of tiles in line direction: 16.

Maximum number of cells/tile in path direction: 1024.

Maximum number of cells/tile in line direction: 1024.

Limits on pel path: None.

Limits on line progression: None.

Limits on image offset: None.

Other: None.

T.15.9

Same as Model Profile: No

 

BEGIN APPLICATION STRUCTURE

BEGIN APPLICACION STRUCTURE BODY

END APPLICATION STRUCTURE

[v4]

References:

5.2.18

5.2.19

5.2.20

Element is: Required No; Permitted Yes; Prohibited No;

Limits on the maximum number of defined structures within a picture: None.

Limits on the number and identity of elements comprising a structure: None.

To the application structure identifier parameter, state the meaning:

Assigned beyond being a unique identifier for the application structure:

Is the inheritance flag parameter restricted? Yes/no: Yes. The value of the inheritance flag is restricted to a value corresponding to "statelist".

Other: The value of the structure type parameter must be chosen from the list of valid structure types listed in the Section 3.2.1. Structures are sensitive to placement and are allowed according to the rules defined in Section 3.2.1, and placed in the metafile according to the content model defined in the XML DTD fragment in Section 3.3..

Element is: Required No; Permitted Yes; Prohibited No;

Limits on the maximum number of defined structures within a picture: None.

Limits on the number and identity of elements comprising a structure: None.

To the application structure identifier parameter, state the meaning:

Assigned beyond being a unique identifier for the application structure:

Is the inheritance flag parameter restricted? Yes/no: No

Other: None.

4.5 Metafile Descriptor Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.16.1

Same as Model Profile: No

 

METAFILE VERSION

[v1]

References:

5.3.1

Element is: Required Yes;

Metafile versions permitted by this profile: 1 , 2, 3, 4

Other: None.

Element is: Required Yes;

Metafile versions permitted by this profile:1, 2, 3, 4

Other: None.

T.16.2

Same as Model Profile: No

 

METAFILE DESCRIPTION

[v1]

References:

5.3.2

7.5.2.1

7.5.2.2

7.5.4.6

T.14.1

T.14.5

Element is: Required Yes;

The description parameter shall follow the rules for non-graphical text, clause 7.5.4.6 and T.14.5. The substring within the SF parameter shall be of the form: "keyword:item", where the double quotes are part of the substring.

Maximum number of occurrences of this element? 1

Profile identification (use keyword, "ProfileId:"): "ProfileId:WebCGM".

Profile edition (use keyword, "ProfileEd:"):

Refers to the approved version and revision of the specification that applies for this graphic. The Item associated with the keyword ProfileEd shall be n.m. Example: "ProfileEd:1.0".

Additional information content:

Metafile colour conformance class, source, and date items shall be encoded as substrings of the description parameter using the keywords: "ColourClass:", "Source:", and "Date:", respectively.

ColourClass: Required Yes;

  • Content: One of "ColourClass:monochrome" or "ColourClass:colour".

Source? Required No; Permitted Yes;

  • Content: "Source:supplier"

Date? Required No; Permitted Yes;

  • Content: "Date:yyyymmdd"

Other: None.

Element is: Required Yes;

The description parameter shall follow the rules for non-graphical text, clause 7.5.4.6 and T.14.5. The substring within the SF parameter shall be of the form: "keyword:item", where the double quotes are part of the substring.

Maximum number of occurrences of this element? Unlimited.

Profile identification (use keyword, "ProfileId:"): "ProfileId:Model-Profile".

Profile edition (use keyword, "ProfileEd:"): "ProfileEd:1".

If the profile edition is not given, then the edition defaults to 1.

Additional information content:

Metafile colour conformance class, source, and date items shall be encoded as substrings of the description parameter using the keywords: "ColourClass:", "Source:", and "Date:", respectively.

ColourClass: Required Yes; Permitted No;

  • Content: (One of: colour, greyscale, or monochrome.)

Source? Required Yes; Permitted No;

  • Content: (Vendor, product, and version).

Date? Required Yes; Permitted No;

  • Content shall be date of metafile generation. The form and content shall be in accordance with ISO 8601:1988.

Other: None.

T.16.3

Same as Model Profile: No

 

VDC TYPE

[v1]

References:

5.3.3

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? None.

Other: None.

Element is: Required Yes; Permitted No;

Any restrictions on the parameter value? None.

Other: None.

T.16.4

Same as Model Profile: Yes

 

INTEGER PRECISION

[v1]

References:

5.3.4

Element is: Required No; Permitted Yes;

The parameter value of this element is encoding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.16.5

Same as Model Profile: Yes

 

REAL PRECISION [v1]

References:

5.3.5

Element is: Required No; Permitted Yes;

The parameter value of this element is encoding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.16.6

Same as Model Profile: Yes

 

INDEX PRECISION

[v1]

References:

5.3.6

Element is: Required No; Permitted Yes;

The parameter value of this element is encoding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.16.7

Same as Model Profile: Yes

 

COLOUR PRECISION

[v1]

References:

5.3.7

Element is: Required No; Permitted Yes;

The parameter value of this element is encoding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.16.8

Same as Model Profile: Yes

 

COLOUR INDEX PRECISION

[v1]

References:

5.3.8

Element is: Required No; Permitted Yes;

The parameter value of this element is encoding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.16.9

Same as Model Profile: No

 

MAXIMUM COLOUR INDEX

[v1]

References:

5.3.9

Element is: Required No; Permitted Yes; Prohibited No;

Is this element required to be a least upper bound? (yes/no)

No.

Any restrictions on the parameter values?

  • 0-1 for monochrome metafiles.
  • 0-255 for colour metafiles.

Other: Greyscale is considered a special case of colour.

Element is: Required No; Permitted Yes; Prohibited No;

Is this element required to be a least upper bound? (yes/no) No.

Any restrictions on the parameter values?

  • 0-1 for monochrome metafiles.
  • 0-63 for greyscale metafiles.
  • 0-255 for colour metafiles.

Other: None.

T.16.10

Same as Model Profile: Yes

 

COLOUR VALUE EXTENT

[v1]

References:

5.3.10

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? None.

Other: None.

T.16.11

Same as Model Profile: Yes

 

METAFILE ELEMENT LIST

[v1]

References:

5.3.11

Element is: Required Yes;

Other: None.

T.16.12

Same as Model Profile: Yes

 

METAFILE DEFAULTS REPLACEMENT

[v1]

References:

5.3.12

Element is: Required No; Permitted Yes; Prohibited No;

Is each occurrence of the MDR restricted to defining just one default? (yes/no) No.

Additional restrictions may be specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.16.13

Same as Model Profile: No

 

FONT LIST

[v1]

References:

5.3.13

annex H

Element is: Required No; Permitted Yes; Prohibited No;

This element is required for all metafiles containing graphical text.

Maximum number of fonts in the list: 256

All font indexes referenced in the metafile, including the default (nominally index 1) shall be defined in the FONT LIST element, with font name construction consistent with the rules of ISO/IEC 9541.

List of recommended fonts:

  • Times-Roman
  • Times-Bold
  • Times-Italic
  • Times-BoldItalic
  • Helvetica 
  • Helvetica-Bold
  • Helvetica-Oblique
  • Helvetica-BoldOblique
  • Courier
  • Courier-Bold
  • Courier-Oblique
  • Courier-BoldOblique
  • Symbol

NOTE - Theses font names are trademarked and some are proprietary and copyrighted. Times and Helvetica are registered trademarks of Allied Corporation, the owner of the copyright on the fonts of those names. Metric equivalents of the named fonts may be substituted by interpreters. Times is a serif font. Helvetica is a sans-serif font. Courier is a monospaced, serif font. The association of character code to glyph which shall be used for each of the fonts and the metrics of the named fonts are contained in annex H.

Other: The list of recommended fonts is intended to be a list of required minimum interpreter font capability and a recommended maximum font capability for generators. If other fonts are used, the FONT PROPERTIES and RESTRICTED TEXT elements are required.

Element is: Required No; Permitted Yes; Prohibited No;

This element is required for all metafiles containing graphical text.

Maximum number of fonts in the list: 64.

All font indexes referenced in the metafile, including the default (nominally index 1) shall be defined in the FONT LIST element, with font name construction consistent with the rules of ISO/IEC 9541.

List of permitted fonts:

  • Times-Roman
  • Times-Bold
  • Times-Italic
  • Times-BoldItalic
  • Helvetica
  • Helvetica-Bold
  • Helvetica-Oblique
  • Helvetica-BoldOblique
  • Courier
  • Courier-Bold
  • Courier-Oblique
  • Courier-BoldOblique
  • Symbol

NOTE - Theses font names are trademarked and some are proprietary and copyrighted. Times and Helvetica are registered trademarks of Allied Corporation, the owner of the copyright on the fonts of those names. Metric equivalents of the named fonts may be substituted by interpreters. Times is a serif font. Helvetica is a sans-serif font. Courier is a monospaced, serif font. The association of character code to glyph which shall be used for each of the fonts and the metrics of the named fonts are contained in annex H.

Other: None.

T.16.14

Same as Model Profile: No

 

CHARACTER SET LIST

[v1]

References:

5.3.14

Element is: Required No; Permitted Yes; Prohibited No;

This element is required for all metafiles containing graphical text.

Maximum limit for the number of character sets in the character set list: 5.

Character sets shall be selected from the ISO Registry of Character Sets. This list may be extended by adding profile-defined character sets. List character sets: :

"94-character G-set", 4/2 (ISO 8859-1 LH);

"96-character G-set", 4/1 (ISO 8859-1 RH);

"94-character G-set", 2/10 3/10 (Symbol LH);

"94-character G-set", 2/6 3/10 (Symbol RH);.

"complete code", 4/9 (UTF-8)

"complete code", 4/12 (UTF-16)

If any of these character sets is of type "complete code", specify the content of the complete code and its associated sequence tail: Specified

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

This element is required for all metafiles containing graphical text.

Maximum limit for the number of character sets in the character set list: 4.

Character sets shall be selected from the ISO Registry of Character Sets. This list may be extended by adding profile-defined character sets. List character sets:

"94-character G-set", 4/2 (ISO 8859-1 LH);

"96-character G-set", 4/1 (ISO 8859-1 RH);

"94-character G-set", 2/10 3/10 (Symbol LH);

"94-character G-set", 2/6 3/10 (Symbol RH).

If any of these character sets is of type "complete code", specify the content of the complete code and its associated sequence tail:
Not applicable.

Other: None.

T.16.15

Same as Model Profile: No

 

CHARACTER CODING ANNOUNCER

[v1]

References:

5.3.15

Element is: Required Yes;

Any restrictions on the parameter values? Value shall be 'basic 8-bit'.

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? Values shall be 'basic 7-bit' and 'basic 8-bit'.

Other: None.

T.16.16

Same as Model Profile: No

 

NAME PRECISION

[v2]

References:

5.3.16

Element is: Required No; Permitted No; Prohibited Yes;

The parameter value of this element is coding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other.

Element is: Required No; Permitted Yes;

The parameter value of this element is coding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.16.17

Same as Model Profile: Yes

 

MAXIMUM VDC EXTENT

[v2]

References:

5.3.17

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? None.

Other: None.

T.16.18

Same as Model Profile: No

 

SEGMENT PRIORITY EXTENT

[v2]

References:

5.3.18

Element is: Required No; Permitted No; Prohibited Yes;

Any restrictions on the parameter values.

Other.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? None.

Other: None.

T.16.19

Same as Model Profile: No

 

COLOUR MODEL

[v3]

References:

5.3.19

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of colour models? Shall be 1, 6, 7, or 8..

Other: Values 6, 7, and 8 are the registered values for RGB

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of colour models? None.

Other: None.

T.16.20

Same as Model Profile: No

 

COLOUR CALIBRATION

[v3]

References:

5.3.20

Element is: Required No; Permitted No; Prohibited Yes;

Calibration selection values permitted in accordance with the permitted model(s):

If CYMK is permitted, minimum number of grid locations:

Any restrictions on the number of colour lookup table entries, n?

Any restrictions on the number of grid locations, m?

If CYMK is permitted, algorithms for interpolation between grid locations?

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Calibration selection values permitted in accordance with the permitted model(s): Values 1..6, 9.

If CYMK is permitted, minimum number of grid locations: 3.

Any restrictions on the number of colour lookup table entries, n? None.

Any restrictions on the number of grid locations, m? None.

If CYMK is permitted, algorithms for interpolation between grid locations? None.

Other: None.

T.16.21

Same as Model Profile: No

 

FONT PROPERTIES

[v3]

References:

5.3.21

Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? The required parameters, when used, are INDEX, FONT FAMILY, POSTURE, WEIGHT, PROPORTIONATE WIDTH, DESIGN GROUP and STRUCTURE.

Other: This element is required when a font is used that is not is the list of recommended fonts specified in the FONT LIST element..

Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? All defined index and enumerated values of all parameters shall be permitted.

Other: None.

T.16.22

Same as Model Profile: No

 

GLYPH MAPPING

[v3]

References:

5.3.22

Required No; Permitted No; Prohibited Yes;

Subset of AFII registered glyphs which may be referenced:

Maximum number of glyphs which may be defined:

Other:

Required No; Permitted Yes; Prohibited No;

Subset of AFII registered glyphs which may be referenced: None.

Maximum number of glyphs which may be defined: 8192.

Other: None.

T.16.23

Same as Model Profile: No

 

SYMBOL LIBRARY LIST

[v3]

References:

5.3.23

Required No; Permitted Yes; Prohibited No;

Libraries which may be accessed and their encoding rules:

See discussion of symbol libraries in Section 4.17.

Maximum number of libraries which may be accessed: 8

Other: Symbol Library names shall be valid URLs according to RFC-1738 and RFC-1808. URLs used as Symbol Library names shall not contain non-null fragment specification. If a WebCGM URL in full generality is of the form "<base-URL>#<pict-part>.<obj-part>" (see 2.3.6), then valid URLs for Symbol Library names are either of the form "<base-URL>", or "<base-URL>#". A URL which consists only of "#" refers to the metafile itself in which this Symbol Library reference is contained.

Required No; Permitted No; Prohibited Yes;

Libraries which may be accessed and their encoding rules:

Maximum number of libraries which may be accessed:

Other:

NOTE - There are currently no registered symbol libraries.

T.16.24

Same as Model Profile: No

 

PICTURE DIRECTORY

[v4]

References:

5.3.24

Required No; Permitted No; Prohibited Yes;

Follow the rules for non-graphical text strings for picture identifier parameter, clause 7.5.4.6.

Other: None.

Required No; Permitted No; Prohibited Yes;

Follow the rules for non-graphical text strings for picture identifier parameter, clause 7.5.4.6.

Other: None.

4.6 Picture Descriptor Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.17.1

Same as Model Profile: No

 

SCALING MODE

[v1]

References:

5.4.1

Element: Required Yes;

Any restrictions on the parameter values?

SCALING MODE shall be metric.

Other: None.

Element: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? If SCALING MODE is metric then the 'metric scale factor' shall be positive.

Other: None.

T.17.2

Same as Model Profile: Yes

 

COLOUR SELECTION MODE

[v1][v2]

References:

5.4.2

Element: Required No; Permitted Yes;

Any restrictions on the parameter values? None.

Other: None.

T.17.3

Same as Model Profile: Yes

 

LINE WIDTH SPECIFICATION MODE

[v1][v2]

References:

5.4.3

Element: Required No; Permitted Yes;

Any restrictions on the parameter values? None.

Other: None.

T.17.4

Same as Model Profile: Yes

 

MARKER SIZE SPECIFICATION MODE

[v1][v2]

References:

5.4.4

Element: Required No; Permitted Yes;

Any restrictions on the parameter values? None.

Other: None.

T.17.5

Same as Model Profile: Yes

 

EDGE WIDTH SPECIFICATION MODE

[v1][v2]

References:

5.4.5

Element: Required No; Permitted Yes;

Any restrictions on the parameter values? None.

Other: None.

T.17.6

Same as Model Profile: Yes

 

VDC EXTENT

[v1]

References:

5.4.6

Element: Required No; Permitted Yes;

Limits on the sense and orientation of the VDC space: None.

Is zero-area VDC extent permitted? (yes/no) No.

If yes, specify its meaning.

Other: None.

T.17.7

Same as Model Profile: Yes

 

BACKGROUND COLOUR

[v1]

References:

5.4.7

7.5.4.1

T.14.1

Element: Required No; Permitted Yes;

The colour value parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Other: None.

T.17.8

Same as Model Profile: Yes

 

DEVICE VIEWPORT

[v2]

References:

5.4.8

Element: Required No; Permitted No; Prohibited Yes;

Interaction of this element with environmental presentation directives:

Meaning of this element if the specified value is inconsistent with the presentation device:

Other:

NOTE - This element is prohibited due to its device dependence.

T.17.9

Same as Model Profile: Yes

 

DEVICE VIEWPORT

SPECIFICATION MODE

[v2]

References:

5.4.9

Element: Required No; Permitted No Prohibited Yes;

Set of legal values:

Other:

NOTE - This element is prohibited due to its device dependence.

T.17.10

Same as Model Profile: Yes

 

DEVICE VIEWPORT MAPPING

[v2]

References:

5.4.10

Element: Required No; Permitted No; Prohibited Yes;

Set of legal values:

Other:

NOTE - This element is prohibited due to its device dependence.

T.17.11

Same as Model Profile: No

 

LINE REP- RESENTATION

[v2]

References:

5.4.11

7.5.2.6

7.5.4.2

T.20.1

Element: Required No; Permitted No; Prohibited Yes;

Maximum number of simultaneous bundle definitions:

Other:

Element: Required No; Permitted Yes; Prohibited No;

Maximum number of simultaneous bundle definitions: 20.

Other: None.

T.17.12

Same as Model Profile: No

 

MARKER REP- RESENTATION

[v2]

References:

5.4.12

7.5.2.6

7.5.4.2

T.20.5

Element: Required No; Permitted No; Prohibited Yes;

Maximum number of simultaneous bundle definitions:

Other:

Element: Required No; Permitted Yes; Prohibited No;

Maximum number of simultaneous bundle definitions: 20.

Other: None.

T.17.13

Same as Model Profile: No

 

TEXT REP- RESENTATION

[v2]

References:

5.4.13

7.5.2.6

7.5.4.2

T.20.9

Element: Required No; Permitted No; Prohibited Yes;

Maximum number of simultaneous bundle definitions:

Other:

Element: Required No; Permitted Yes; Prohibited No;

Maximum number of simultaneous bundle definitions: 20.

Other: None.

T.17.14

Same as Model Profile: No

 

FILL REP- RESENTATION

[v2]

References:

5.4.14

7.5.2.6

7.5.4.2

T.20.21

Element: Required No; Permitted No; Prohibited Yes;

Maximum number of simultaneous bundle definitions:

Other:

Element: Required No; Permitted Yes; Prohibited No;

Maximum number of simultaneous bundle definitions: 20.

Other: None.

T.17.15

Same as Model Profile: No

 

EDGE REP- RESENTATION

[v2]

References:

5.4.15

7.5.2.6

7.5.4.2

T.20.26

Element: Required No; Permitted No; Prohibited Yes;

Maximum number of simultaneous bundle definitions:

Other:

Element: Required No; Permitted Yes; Prohibited No;

Maximum number of simultaneous bundle definitions: 20.

Other: None.

T.17.16

Same as Model Profile: Yes

 

INTERIOR STYLE SPECIFICATION MODE

[v3]

References:

5.4.16

Element: Required No; Permitted Yes;

Any restriction on the parameter value? None.

Other: None.

T.17.17

Same as Model Profile: Yes

 

LINE AND EDGE TYPE DEFINITION

[v3]

References:

5.4.17

Element: Required No; Permitted Yes; Prohibited No;

Any limits on the number of definitions? Maximum of 32 line types shall be specified simultaneously.

Any limits on the number of elements in a given definition? Number of values in the dash gap list shall not exceed 8.

Any restrictions on the dash cycle repeat length? None.

Any restrictions on complexity of definition to prevent degeneracies? None.

Other: None.

T.17.18

Same as Model Profile: Yes

 

HATCH STYLE DEFINITION

[v3]

References:

5.4.18

Element: Required No; Permitted Yes; Prohibited No;

Limit on the number of hatch styles? Maximum of 32 hatch styles shall be specified simultaneously.

Limit on the number of gaps in a given definition? Number of entries in the gap width list shall not exceed 8.

Any limits on duty cycle length? None.

Any restrictions on complexity of definition to prevent degeneracies? None.

Any restrictions on the style indicator? None.

Other: None.

T.17.19

Same as Model Profile: No

 

GEOMETRIC PATTERN DEFINITION

[v3]

References:

5.4.19

Element: Required No; Permitted No; Prohibited Yes;

Any limits on the number of geometric patterns defined?

Any limits on the classes of primitives?

Other:

Element: Required No; Permitted Yes; Prohibited No;

Any limits on the number of geometric patterns defined? The maximum number of geometric patterns is 64.

Any limits on the classes of primitives? None.

Other: None.

NOTE - The number of geometric patterns cannot exceed the number of segments.

T.17.20

Same as Model Profile: No

 

APPLICATION STRUCTURE DIRECTORY

[v4]

References:

5.3.20

Element: Required No; Permitted No; Prohibited Yes;

Follow rules for non-graphical text strings for application structure identifier parameter, clause 7.5.4.6. .

Other: None.

Element: Required No; Permitted Yes; Prohibited No;

Follow rules for non-graphical text strings for application structure identifier parameter, clause 7.5.4.6. .

Other: None.

4.7 Control Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.18.1

Same as Model Profile: Yes

 

VDC INTEGER PRECISION

[v1]

References:

5.5.1

Element is: Required No; Permitted Yes;

The parameter values of this element are encoding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.18.2

Same as Model Profile: Yes

 

VDC REAL PRECISION

[v1]

References:

5.5.2

Element is: Required No; Permitted Yes;

The parameter values of this element are encoding dependent. Restrictions are specified in parts 2, 3, and 4 of ISO/IEC 8632.

Other: None.

T.18.3

Same as Model Profile: No

 

AUXILIARY COLOUR

[v1]

References:

5.5.3

7.5.4.1

T.14.1

D.4.4.1

Element is: Required No; Permitted No; Prohibited Yes;

The auxiliary colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

The auxiliary colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Other: None.

T.18.4

Same as Model Profile: No

 

TRANSPARENCY

[v1]

References:

5.5.4

T.14.1

Element is: Required No; Permitted No; Prohibited Yes;

Any restriction on the parameter value?

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Any restriction on the parameter value? None.

Other: None.

T.18.5

Same as Model Profile: Yes

 

CLIP RECTANGLE

[v1]

References:

5.5.5

D.4.4.2

Element is: Required No; Permitted Yes; Prohibited No;

Meaning of boundary cases for:

zero-area: Prohibited.

area greater than VDC extent: Clipping shall be done to the intersection of CLIP RECTANGLE and VDC EXTENT.

additional cases: None.

Other: None.

T.18.6

Same as Model Profile: Yes

 

CLIP INDICATOR [v1]

References:

5.5.6

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.18.7

Same as Model Profile: No

 

LINE CLIPPING MODE

[v2]

References:

5.5.7

D.4.4.3

Element is: Required No; Permitted No; Prohibited Yes;

Note: CGM:1992 defect number 1/051 has corrected the default value to 'interpreter dependent', and defect number 1/063 has added corrective text to T.26.7. See T.26.7.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.18.8

Same as Model Profile: No

 

MARKER CLIPPING MODE [v2]

References:

5.5.8

D.4.4.3

Element is: Required No; Permitted No; Prohibited Yes;

Note: CGM:1992 defect number 1/051 has corrected the default value to 'interpreter dependent', and defect number 1/063 has added corrective text to T.26.7. See T.26.7.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.18.9

Same as Model Profile: No

 

EDGE CLIPPING MODE

[v2]

References:

5.5.9

D.4.4.3

Element is: Required No; Permitted No; Prohibited Yes;

Note: CGM:1992 defect number 1/051 has corrected the default value to 'interpreter dependent', and defect number 1/063 has added corrective text to T.26.7. See T.26.7.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.18.10

Same as Model Profile: Yes

 

NEW REGION

[v2]

References:

5.5.10

Element is: Required No; Permitted Yes; Prohibited No;

This element shall be permitted only if BEGIN FIGURE is permitted.

Any restrictions on the number of occurrences? None.

Other: None.

T.18.11

Same as Model Profile: No

 

SAVE PRIMITIVE CONTEXT

[v2]

References:

5.5.11

Element is: Required No; Permitted No; Prohibited Yes;

Maximum number of simultaneously saved contexts:

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of simultaneously saved contexts: 1024.

Other: None.

T.18.12

Same as Model Profile: No

 

RESTORE PRIMITIVE CONTEXT

[v2]

References:

5.5.12

Element is: Required No; Permitted No; Prohibited Yes;

This element is permitted only if SAVE PRIMITIVE CONTEXT is permitted.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

This element is permitted only if SAVE PRIMITIVE CONTEXT is permitted.

Other: None.

T.18.13

Same as Model Profile: No

 

PROTECTION REGION INDICATOR

[v3]

References:

5.5.13

Element is: Required No; Permitted No; Prohibited Yes;

This element shall be permitted only if BEGIN PROTECTION REGION is permitted.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

This element shall be permitted only if BEGIN PROTECTION REGION is permitted.

Other: None.

T.18.14

Same as Model Profile: No

 

GENERALIZED TEXT PATH MODE

[v3]

References:

5.5.14

Element is: Required No; Permitted No; Prohibited Yes;

Any restrictions on the parameter value?

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.18.15

Same as Model Profile: Yes

 

MITRE LIMIT

[v3]

References:

5.5.15

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.18.16

Same as Model Profile: Yes

 

TRANSPARENT CELL COLOUR

[v3]

References:

5.5.16

Element is: Required No; Permitted Yes; Prohibited No;

The transparent cell colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Any restrictions on the parameter values? None.

Other: None.

4.8 Graphical Primitive Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.19.1

Same as Model Profile: Yes

 

POLYLINE

[v1]

References:

5.6.1

7.5.4.3

D.2.21

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of points or state "no limit": 4096.

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.2

Same as Model Profile: Yes

 

DISJOINT POLYLINE

[v1]

References:

5.6.2

7.5.4.3

D.2.2.1

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of points or state "no limit": 4096.

Zero-length geometric degeneracies shall be as defined in clause 7.5.2.3.

Other: None.

T.19.3

Same as Model Profile: Yes

 

POLYMARKER

[v1]

References:

5.6.3

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of points or state "no limit": 4096.

Other: None.

T.19.4

Same as Model Profile: No

 

TEXT

[v1]

References:

5.6.4

7.5.4.5

Element is: Required No; Permitted No; Prohibited Yes;

The string parameter shall follow the rules for graphical text, clause 7.5.4.5.

Is the 'not final' flag allowed: (yes/no)

Other: Graphical text shall be represented by the Restricted Text element in this profile.

Element is: Required No; Permitted Yes; Prohibited No;

The string parameter shall follow the rules for graphical text, clause 7.5.4.5.

Is the 'not final' flag allowed: (yes/no) Yes.

Other: None.

T.19.5

Same as Model Profile: Yes

 

RESTRICTED TEXT

[v1]

References:

5.6.5

7.5.4.5

T.25.7

D.4.5.2

Element is: Required No; Permitted Yes; Prohibited No;

The string parameter shall follow the rules for graphical text, clause 7.5.4.5.

Is the 'not final' flag allowed: (yes/no) Yes.

For[v1/2] metafiles, is the realization of RESTRICTED TEXT according to one of the standard or registered values for RESTRICTED TEXT TYPE? (yes/no)Yes.

If yes, specify. Boxed-cap, also see T.25.7

For [v3] metafiles, RESTRICTED TEXT TYPE shall be used if this element is used.

Other: None.

T.19.6

Same as Model Profile: Yes

 

APPEND TEXT

[v1]

References:

5.6.6.

7.5.4.5

D.4.5.1

Element is: Required No; Permitted Yes; Prohibited No;

The string parameter shall follow the rules for graphical text, clause 7.5.4.5.

Other: None.

T.19.7

Same as Model Profile: Yes

 

POLYGON

[v1]

References:

5.6.7

7.5.4.4

D.2.2.2

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of points: 4096.

Zero-area geometric degeneracies shall be as defined in clause 7.5.4.4.

Other: None.

T.19.8

Same as Model Profile: Yes

 

POLYGON SET

[v1]

References:

5.6.8

7.5.4.4

D.2.2.2

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of points: 4096.

Number of polygons in a set? No limit.

Zero-area geometric degeneracies shall be as defined in clause 7.5.4.4.

Other: Each individual polygon within a set shall have at least 3 points.

T.19.9

Same as Model Profile: No

 

CELL ARRAY

[v1]

References:

5.6.9

D.4.5.3

Element is: Required No; Permitted Yes; Prohibited No;

Limit for nx: 4096

Limit for ny: 4096

Limit for nx*ny: 16777216

Are rotated and skewed cell arrays allowed? (yes/no) No.

If yes, specify the graphical meaning.

Other: Zero-area cell arrays are prohibited.

Element is: Required No; Permitted Yes; Prohibited No;

Limit for nx: 2048.

Limit for ny: 2048.

Limit for nx*ny: 4194304.

Are rotated and skewed cell arrays allowed? (yes/no) No.

If yes, specify the graphical meaning.

Other: Zero-area cell arrays are prohibited.

T.19.10

Same as Model Profile: Yes

 

GENERALIZED DRAWING PRIMITIVE

[v1]

References:

5.6.10

Element is: Required No; Permitted No; Prohibited Yes;

List all the registered GDPs that are allowed:

List all profile-defined GDPs that are allowed and attach complete description:

Other:

T.19.11

Same as Model Profile: Yes

 

RECTANGLE

[v1]

References:

5.6.11

7.5.4.4

D.2.2.2

Element is: Required No; Permitted Yes; Prohibited No;

Zero-area geometric degeneracies shall be as defined in clause 7.5.4.4.

Other: None.

T.19.12

Same as Model Profile: Yes

 

CIRCLE

[v1]

References:

5.6.12

7.5.4.4

D.2.2.2

Element is: Required No; Permitted Yes; Prohibited No;

Zero-area geometric degeneracies shall be as defined in clause 7.5.4.4.

Other: None.

T.19.13

Same as Model Profile: Yes

 

CIRCULAR ARC 3 POINT

[v1]

References:

5.6.13

7.5.4.3

D.2.2.2

D.4.5.4

Element is: Required No; Permitted Yes; Prohibited No;

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.14

Same as Model Profile: Yes

 

CIRCULAR ARC 3 POINT CLOSE

[v1]

References:

5.6.14

7.5.4.4

D.2.2.2

D.4.5.5

Element is: Required No; Permitted Yes; Prohibited No;

Zero-area geometric degeneracies shall be as defined in clause 7.5.4.4.

Other: None.

T.19.15

Same as Model Profile: Yes

 

CIRCULAR ARC CENTRE

[v1]

References:

5.6.15

7.5.4.3

D.2.2.2

D.4.5.6

Element is: Required No; Permitted Yes; Prohibited No;

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.16

Same as Model Profile: Yes

 

CIRCULAR ARC CENTRE CLOSE

[v1]

References:

5.6.16

7.5.4.4

D.2.2.2

D.4.5.7

Element is: Required No; Permitted Yes; Prohibited No;

Zero-area geometric degeneracies shall be as defined in clause 7.5.4.4.

Other: None.

T.19.17

Same as Model Profile: Yes

 

ELLIPSE

[v1]

References:

5.6.17

7.5.4.4

D.2.2.2

D.4.5.9

D.4.5.10

Element is: Required No; Permitted Yes; Prohibited No;

Zero-area geometric degeneracies shall be as defined in clause 7.5.4.4.

Other: None.

T.19.18

Same as Model Profile: Yes

 

ELLIPTICAL ARC [v1]

References:

5.6.18

7.5.4.3

D.2.2.1

D.4.5.11

Element is: Required No; Permitted Yes; Prohibited No;

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.19

Same as Model Profile: Yes

 

ELLIPTICAL ARC CLOSE

[v1]

References:

5.6.19

7.5.4.4

D.2.2.2

D.4.5.12

Element is: Required No; Permitted Yes; Prohibited No;

Zero-area geometric degeneracies shall be as defined in clause 7.5.4.4.

Other: None.

T.19.20

Same as Model Profile: Yes

 

CIRCULAR ARC CENTRE REVERSED

[v2]

References:

5.6.20

7.5.4.3

D.2.2.1

D.4.5.8

Element is: Required No; Permitted Yes; Prohibited No;

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.21

Same as Model Profile: Yes

 

CONNECTING EDGE

[v2]

References:

5.6.21

7.5.4.3

D.2.2.1

Element is: Required No; Permitted Yes; Prohibited No;

This element shall be permitted only if BEGIN/END FIGURE is permitted.

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.22

Same as Model Profile: No

 

HYPERBOLIC ARC

[v3]

References:

5.6.22

7.5.4.3

D.2.2.1

Element is: Required No; Permitted No; Prohibited Yes;

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.23

Same as Model Profile: No

 

PARABOLIC ARC

[v3]

References:

5.6.23

7.5.4.3

D.2.2.1

Element is: Required No; Permitted No; Prohibited Yes;

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.24

Same as Model Profile: No

 

NON-UNIFORM B-SPLINE

[v3]

References:

5.6.24

7.5.4.3

D.2.2.1

Element is: Required No; Permitted No; Prohibited Yes;

Set of spline orders:

Maximum number of control points:

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Set of spline orders: cubic spline.

Maximum number of control points: 4096.

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.25

Same as Model Profile: No

 

NON-UNIFORM RATIONAL B-SPLINE

[v3]

References:

5.6.25

7.5.4.3

D.2.2.1

Element is: Required No; Permitted No; Prohibited Yes;

Set of spline orders:

Maximum number of control points:

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Set of spline orders: cubic spline.

Maximum number of control points: 4096.

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.26

Same as Model Profile: Yes

 

POLYBEZIER

[v3]

References:

5.6.26

7.5.4.3

D.2.2.1

Element is: Required No; Permitted Yes; Prohibited No;

Maximum number of points: 4096.

Any restrictions on the continuity indicator? None.

Zero-length geometric degeneracies shall be as defined in clause 7.5.4.3.

Other: None.

T.19.27

Same as Model Profile: No

 

POLYSYMBOL

[v3]

References:

5.6.27

D.2.2.1

Element is: Required No; Permitted Yes; Prohibited No;

Point list: 4096

Effect of a reference to a symbol index parameter which is not in the symbol library:

Symbol is ignored.

Other: Symbol index refers to a picture in the symbol library metafile as discussed in Section 4.17.

Element is: Required No; Permitted No; Prohibited Yes;

Point list:

Effect of a reference to a symbol index parameter which is not in the symbol library.

Other:

NOTE - This element is prohibited because SYMBOL LIBRARY LIST is prohibited.

T.19.28

Same as Model Profile: No

 

BITONAL TILE

[v3]

References:

5.6.28

D.2.2.1

D.4.5.13

Element is: Required No; Permitted Yes; Prohibited No;

List allowable compression types: 0, 1, 2, 5, or 6.

Requirements on row padding: None.

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

List allowable compression types: Values 0..6.

Requirements on row padding: None.

Other: CCITT compression methods (T6 and T4) should be used with 1 bit cell colour precision and indexed colour.

NOTE - Work is in progress on registration of JPEG. When JPEG is registered, it may be added to the allowable compression type values in a future edition of this profile.

T.19.29

Same as Model Profile: No

 

TILE

[v3]

References:

5.6.29

D.2.2.1

D.4.5.13

Element is: Required No; Permitted Yes; Prohibited No;

List allowable compression types: 0, 1, 2, 5, 6, 7, or 9

Requirements on row padding: None.

Other: The value 9 is the ISO registered value for compression method 0 of PNG.

Element is: Required No; Permitted Yes; Prohibited No;

List allowable compression types: Values 0..6.

Requirements on row padding? None.

Other: CCITT compression methods (T6 and T4) should be used with 1 bit cell colour precision and indexed colour.

NOTE - Work is in progress on registration of JPEG. When JPEG is registered, it may be added to the allowable compression type values in a future edition of this profile.

4.9 Attribute Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.20.1

Same as Model Profile: No

 

LINE BUNDLE INDEX

[v1]

References:

5.7.1

7.5.4.2

D.4.6.1

T.17.11

Element is: Required No; Permitted No; Prohibited Yes;

The line bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values:

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

The line bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values: 1..5.

  • index 1 2 3 4 5

line type 1 2 3 4 5

line width 1.0 1.0 1.0 1.0 1.0

line colour 1 1 1 1 1

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other: None.

T.20.2

Same as Model Profile: No

 

LINE TYPE

[v1]

References:

5.7.2

5.4.17

D.4.6.2

Element is: Required No; Permitted Yes; Prohibited No;

Select 1 or more of the following:

  • values 1..5: Yes
  • subset of registered values (attach list): 6..15: Yes
  • profile-defined values (attach complete description): No

For [v3] metafiles,

  • negative values assigned by the LINE AND EDGE TYPE DEFINITION element. Yes;

Other: Line types 6-15 are included in the Register of Graphical Object. This register is available from the ISO SC24 Committee. See Section 4.18 about specific and generic line types.

Element is: Required No; Permitted Yes; Prohibited No;

Select 1 or more of the following:

  • values 1..5; Yes
  • subset of registered values (attach list); No
  • profile-defined values (attach complete description); No

For [v3] metafiles,

  • negative values assigned by the LINE AND EDGE TYPE DEFINITION element. Yes

Other: None.

T.20.3

Same as Model Profile: Yes

 

LINE WIDTH

[v1]

References:

5.7.3

D.4.6.3

Element is: Required No; Permitted Yes; Prohibited No;

Is value zero allowed? (yes/no) Yes.

If yes, specify its meaning. Minimum available line width.

Any restrictions on the parameter value? None.

Other: None.

T.20.4

Same as Model Profile: Yes

 

LINE COLOUR

[v1]

References:

5.7.4

7.5.4.1

T.14.1

Element is: Required No; Permitted Yes; Prohibited No;

The line colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Any restrictions on the parameter value? None.

Other: None.

T.20.5

Same as Model Profile: No

 

MARKER BUNDLE INDEX

[v1]

References:

5.7.5

7.5.4.2

T.17.12

D.4.6.1

Element is: Required No; Permitted No; Prohibited Yes;

The marker bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values: 1..5.

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

The marker bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values: 1..5.

index 1 2 3 4 5

marker type 1 2 3 4 5

marker width 1.0 1.0 1.0 1.0 1.0

marker colour 1 1 1 1 1

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other: None.

T.20.6

Same as Model Profile: Yes

 

MARKER TYPE

[v1]

References:

5.7.6

D.4.6.4

Element is: Required No; Permitted Yes; Prohibited No;

Indicate one or more of the following restrictions:

  • values 1..5; Yes
  • subset of registered values (attach list); No
  • profile-defined values (attach complete description). No

Other: None.

T.20.7

Same as Model Profile: Yes

 

MARKER SIZE

[v1]

References:

5.7.7

D.4.6.5

Element is: Required No; Permitted Yes; Prohibited No;

Is value zero allowed? (yes/no) Yes.

If yes, specify its meaning. Minimum available size.

Any restrictions on the parameter value? None.

Other: None.

T.20.8

Same as Model Profile: Yes

 

MARKER COLOUR

[v1]

References:

5.7.8

7.5.4.1

T.14.1

Element is: Required No; Permitted Yes; Prohibited No;

The marker colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Any restrictions on the parameter value? None.

Other: None.

T.20.9

Same as Model Profile: No

 

TEXT BUNDLE INDEX

[v1]

References:

5.7.9

7.5.4.2

T.17.13

D.4.6.1

Element is: Required No; Permitted No; Prohibited Yes;

The text bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

  • For [v1] metafiles, allowable index values:

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

The text bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values: 1..2.

index 1 2

font index 1 1

text precision stroke stroke

character expansion factor 1.0 0.7

character spacing 0.0 0.0

text colour 1 1

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other: None.

T.20.10

Same as Model Profile: Yes

 

TEXT FONT INDEX

[v1]

References:

5.7.10

7.5.4.2

T.16.13

Element is: Required No; Permitted Yes; Prohibited No;

Every referenced index shall refer to an entry in the FONT LIST (see T.16.13).

Other: None.

T.20.11

Same as Model Profile: No

 

TEXT PRECISION

[v1]

References:

5.7.11

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? Value shall be 'stroke'.

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.20.12

Same as Model Profile: Yes

 

CHARACTER EXPANSION FACTOR

[v1]

References:

5.7.12

D.4.6.7

Element is: Required No; Permitted Yes; Prohibited No;

Is value zero allowed? (yes/no) No.

If yes, state the meaning.

Any restrictions on the parameter value? Values shall be restricted to the range 0.1..10.0

Other: None.

T.20.13

Same as Model Profile: Yes

 

CHARACTER SPACING

[v1]

References:

5.7.13

D.4.6.8

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? Values shall be restricted to the range of -1.0..5.0.

Other: None.

T.20.14

Same as Model Profile: Yes

 

TEXT COLOUR

[v1]

References:

5.7.14

7.5.4.1

T.14.1

Element is: Required No; Permitted Yes; Prohibited No;

The text colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Any restrictions on the parameter value? None.

Other: None.

T.20.15

Same as Model Profile: Yes

 

CHARACTER HEIGHT

[v1]

References:

5.7.15

D.4.6.9

Element is: Required No; Permitted Yes; Prohibited No;

Is zero height allowed: (yes/no) Yes.

If yes, state its meaning: Minimum available height.

Any restrictions on the parameter? None.

Other: None.

T.20.16

Same as Model Profile: Yes

 

CHARACTER ORIENTATION

[v1]

References:

5.7.16

D.4.6.10

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the following distortion aspects?

rotation? None.

skewing? None.

mirroring? None.

aspect ratio? None.

Other: None.

T.20.17

Same as Model Profile: Yes

 

TEXT PATH

[v1]

References:

5.7.17

D.4.6.11

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.20.18

Same as Model Profile: Yes

 

TEXT ALIGNMENT

[v1]

References:

5.7.18

D.4.6.12

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the horizontal and vertical alignment values? None.

Any restrictions on the continuous horizontal and vertical alignment values? None.

Other: None.

T.20.19

Same as Model Profile: No

 

CHARACTER SET INDEX

[v1]

References:

5.7.19

7.5.4.2

T.16.14

T.16.22

D.4.6.13

Element is: Required No; Permitted Yes; Prohibited No;

Every referenced index shall refer to an entry in the CHARACTER SET LIST. This includes implicit reference to the default index value.

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

Every referenced index shall refer to an entry in the CHARACTER SET LIST or GLYPH MAPPING. This includes implicit reference to the default index value.

Other: None.

T.20.20

Same as Model Profile: No

 

ALTERNATE CHARACTER SET INDEX

[v1]

References:

5.7.20

7.5.4.2

T.16.14

T.16.22

D.4.6.13

Element is: Required No; Permitted Yes; Prohibited No;

Every referenced index shall refer to an entry in the CHARACTER SET LIST. This includes implicit reference to the default index value.

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

Every referenced index shall refer to an entry in the CHARACTER SET LIST or GLYPH MAPPING. This includes implicit reference to the default index value.

Other: None.

T.20.21

Same as Model Profile: No

 

FILL BUNDLE INDEX

[v1]

References:

5.7.21

7.5.4.2

T.17.14

D.4.6.1

Element is: Required No; Permitted No; Prohibited Yes;

The fill bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values:

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

The fill bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values: 1..5.

index 1 2 3 4 5

interior style hatch hatch hatch hatch hatch

fill colour 1 1 1 1 1

hatch index 1 2 3 4 5

pattern index 1 1 1 1 1

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other: None.

T.20.22

Same as Model Profile: Yes

 

INTERIOR STYLE

[v1]

References:

5.7.22

D.4.6.15

Element is: Required No; Permitted Yes; Prohibited No;

For 'hollow' interior style, line type and width of the bounding line: Solid line type and default line width.

Any restrictions on the parameter value? None.

Other: None.

T.20.23

Same as Model Profile: Yes

 

FILL COLOUR

[v1]

References:

5.7.23

7.5.4.1

T.14.1

Element is: Required No; Permitted Yes; Prohibited No;

The fill colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Any restrictions on the parameter value? None.

Other: None.

T.20.24

Same as Model Profile: Yes

 

HATCH INDEX

[v1]

References:

5.4.18

5.7.24

5.7.4.2

D.4.6.16

Element is: Required No; Permitted Yes; Prohibited No;

Select 1 or more of the following:

  • values 1..6: Yes
  • subset of registered values (attach list): No
  • profile-defined values (attach complete description): No

For [v3] metafiles,

  • negative values assigned by the HATCH STYLE DEFINITION element. Yes

Other: None.

T.20.25

Same as Model Profile: Yes

 

PATTERN INDEX

[v1]

References:

5.7.25

7.5.4.2

Element is: Required No; Permitted Yes; Prohibited No;

The pattern index parameter shall follow the rules for indexes, clause 7.5.4.2.

Any restrictions on the parameter value? None.

Other: None.

T.20.26

Same as Model Profile: No

 

EDGE BUNDLE INDEX

[v1]

References:

5.7.26

7.5.4.2

T.17.15

D.4.6.1

Element is: Required No; Permitted No; Prohibited Yes;

The edge bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values:

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other:

Element is: Required No; Permitted Yes; Prohibited No;

The edge bundle index parameter shall follow the rules for indexes, clause 7.5.4.2.

For [v1] metafiles, allowable index values: 1..5.

  • index 1 2 3 4 5

edge type 1 2 3 4 5

edge width 1.0 1.0 1.0 1.0 1.0

edge colour 1 1 1 1 1

For [v2/3] metafiles, any referenced bundle shall have an explicit representation definition.

Other: None.

T.20.27

Same as Model Profile: Yes

 

EDGE TYPE

[v1]

References:

5.4.17

5.7.27

D.4.6.17

Element is: Required No; Permitted Yes; Prohibited No;

Select 1 or more of the following:

  • values 1..5: Yes
  • subset of registered values (attach list): No
  • profile-defined values (attach complete description): No

For [v3] metafiles,

  • negative values assigned by the LINE AND EDGE TYPE DEFINITION element. Yes

Other: None.

T.20.28

Same as Model Profile: Yes

 

EDGE WIDTH

[v1]

References:

5.7.28

D.4.6.18

Element is: Required No; Permitted Yes; Prohibited No;

Is value zero allowed? (yes/no) Yes.

If yes, specify its meaning. Minimum available edge width.

Any restrictions on the parameter value? None.

Other: None.

T.20.29

Same as Model Profile: Yes

 

EDGE COLOUR

[v1]

References:

5.7.29

7.5.4.1

T.14.1

Element is: Required No; Permitted Yes; Prohibited No;

The edge colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Any restrictions on the parameter value? None.

Other: None.

T.20.30

Same as Model Profile: Yes

 

EDGE VISIBILITY

[v1]

References:

5.7.30

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.20.31

Same as Model Profile: Yes

 

FILL REFERENCE POINT

[v1]

References:

5.7.31

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.20.32

Same as Model Profile: Yes

 

PATTERN TABLE

[v1]

References:

5.7.32

Element is: Required No; Permitted Yes; Prohibited No;

Maximum size for nx: 32.

Allowable values for nx: 8, 16, or 32.

Maximum size for ny: 32.

Allowable values for ny: 8, 16, or 32.

Any restrictions on the number of pattern definitions? 64.

Any restrictions on allowable combinations of nx and ny? None.

Any restrictions on the number of colours? None.

Other: None.

T.20.33

Same as Model Profile: Yes

 

PATTERN SIZE

[v1]

References:

5.7.33

D.4.6.19

Element is: Required No; Permitted Yes; Prohibited No;

Must pattern vertors be parallel to coordinate axes? (yes/no) Yes.

If no, state the meaning of skewed or non-aligned patterns.

Other:

T.20.34

Same as Model Profile: No

 

COLOUR TABLE

[v1]

References:

5.7.34

7.5.4.1

T.14.1

Element is: Required No; Permitted Yes; Prohibited No;

Any limits on the length of colour list? Monochrome: 2, Colour: 256.

Any restrictions on the index values? Index values shall not exceed the maximum colour index.

Other: Greyscale metafiles are considered special cases of colour metafiles.

Element is: Required No; Permitted Yes; Prohibited No;

Any limits on the length of colour list? Monochrome: 2, Greyscale: 64, Colour: 256.

Any restrictions on the index values? Index values shall not exceed the maximum colour index.

Other: None.

T.20.35

Same as Model Profile: No

 

ASPECT SOURCE FLAGS

[v1]

References:

5.7.35

D.4.6.20

Element is: Required No; Permitted No; Prohibited Yes;

Are all ASF values to be the same:

for the metafile? (yes/no)

within each class (line, marker, text, fill, edge) of primitive? (yes/no)

Other:

Element is: Required No; Permitted Yes; Prohibited No;

Are all ASF values to be the same:

for the metafile? (yes/no) No.

within each class (line, marker, text, fill, edge) of primitive? (yes/no) Yes.

Other: None.

T.20.36

Same as Model Profile: No

 

PICK IDENTIFIER

[v2]

References:

5.7.36

Element is: Required No; Permitted No; Prohibited Yes;

Any restrictions on the parameter value? None.

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.20.37

Same as Model Profile: No

 

LINE CAP

[v3]

References:

5.7.37

7.5.7.5

T.25.7

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values for the line cap indicator? (choose 1 or both)

Yes; values 1..4;

No; subset of registered values (attach list).

Any restrictions on the set of values for the dash cap indicator? (choose 1 or both)

Yes; values 1..3;

No; subset of registered values (attach list).

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values for the line cap indicator? (choose 1 or both)

Yes; values 1..5;

No; subset of registered values (attach list).

Any restrictions on the set of values for the dash cap indicator? (choose 1 or both)

Yes; values 1..3;

No; subset of registered values (attach list).

Other: None.

T.20.38

Same as Model Profile: Yes

 

LINE JOIN

[v3]

References:

5.7.38

7.5.7.5

T.25.7

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values? (choose 1 or both)

Yes; values 1..4;

No; subset of registered values (attach list).

Other: None.

T.20.39

Same as Model Profile: Yes

 

LINE TYPE CONTINUATION

[v3]

References:

5.7.39

7.5.7.5

T.25.7

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values? 1..4.

Other: None.

T.20.40

Same as Model Profile: Yes

 

LINE TYPE INITIAL OFFSET

[v3]

References:

5.7.40

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.20.41

Same as Model Profile: Yes

 

TEXT SCORE TYPE

[v3]

References:

5.7.41

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values? (choose 1 or both)

Yes; Values 1..4;

No; Subset of registered values (attach list).

Other: None.

T.20.42

Same as Model Profile: Yes

 

RESTRICTED TEXT TYPE

[v3]

References:

5.7.42

7.5.7.5

T.25.7

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values? (choose 1 or both)

Yes; Values 1..6;

No; Subset of registered values (attach list).

Algorithms for achieving restriction type? (attach) Not specified.

Other: None.

T.20.43

Same as Model Profile: Yes

 

INTERPOLATED INTERIOR

[v3]

References:

5.7.43

Element is: Required No; Permitted Yes; Prohibited No;

Any limits on the number of stages? Maximum number of stages is 8.

Any restrictions on the set of values? (choose 1 or both)

Yes; Values 1..3;

No; Subset of registered values (attach list).

Other: None.

T.20.44

Same as Model Profile: Yes

 

EDGE CAP

[v3]

References:

5.7.44

7.5.7.5

T.25.7

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values for the edge cap indicator? (choose 1 or both)

Yes; values 1..4;

No; subset of registered values (attach list).

Any restrictions on the set of values for the dash cap indicator? (choose 1 or both)

Yes; values 1..3;

No; subset of registered values (attach list).

Other: None.

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values for the edge cap indicator? (choose 1 or both)

Yes; values 1..5;

No; subset of registered values (attach list).

Any restrictions on the set of values for the dash cap indicator? (choose 1 or both)

Yes; values 1..3;

No; subset of registered values (attach list).

Other: None.

T.20.45

Same as Model Profile: Yes

 

EDGE JOIN

[v3]

References:

5.7.45

7.5.7.5

T.25.7

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values? (choose 1 or both)

Yes; values 1..4;

No; subset of registered values (attach list).

Other: None.

T.20.46

Same as Model Profile: Yes

 

EDGE TYPE CONTINUATION

[v3]

References:

5.7.46

7.5.7.5

T.25.7

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the set of values? 1..4.

Other: None.

T.20.47

Same as Model Profile: Yes

 

EDGE TYPE INITIAL OFFSET

[v3]

References:

5.7.47

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter value? None.

Other: None.

T.20.48

Same as Model Profile: No

 

SYMBOL LIBRARY INDEX

[v3]

References:

5.7.48

7.5.4.2

T.16.23

Element is: Required No; Permitted Yes; Prohibited No;

Every referenced index shall refer to an entry in the SYMBOL LIBRARY LIST (see T.16.23).

Other. Refer to discussion of symbol libraries in Section 4.17.

Element is: Required No; Permitted No; Prohibited Yes;

Every referenced index shall refer to an entry in the SYMBOL LIBRARY LIST (see T.16.23).

Other: This element is prohibited because SYMBOL LIBRARY LIST is prohibited.

T.20.49

Same as Model Profile: No

 

SYMBOL COLOUR

[v3]

References:

5.7.49

7.5.4.1

T.14.1

T.16.23

D.4.6.21

Element is: Required No; Permitted Yes; Prohibited No;

The symbol colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Any restrictions on the parameter value? None.

Other: None.

Element is: Required No; Permitted No; Prohibited Yes;

The symbol colour specifier parameter shall follow the rules for colour, clause 7.5.4.1 and T.14.1.

Any restrictions on the parameter value?

Other: This element is prohibited because SYMBOL LIBRARY LIST is prohibited.

T.20.50

Same as Model Profile: No

 

SYMBOL SIZE

[v3]

References:

5.7.50

T.16.23

Element is: Required No; Permitted Yes; Prohibited No;

Is value zero is allowed: (yes/no) Yes

If yes, specify its meaning. Minimum available size.

Any restrictions on the parameter value? None.

Other: None.

Element is: Required No; Permitted No; Prohibited Yes;

Is value zero is allowed: (yes/no)

If yes, specify its meaning.

Any restrictions on the parameter value?

Other: This element is prohibited because SYMBOL LIBRARY LIST is prohibited.

T.20.51

Same as Model Profile: No

 

SYMBOL ORIENTATION

[v3]

References:

5.7.51

T.16.23

D.4.6

Element is: Required No; Permitted Yes; Prohibited No;

Any restrictions on rotation? None.

Any restrictions on skewing? None.

Any restrictions on mirroring? None.

Any restrictions on distortion of aspect ratio? None.

Other: None.

Element is: Required No; Permitted No; Prohibited Yes;

Any restrictions on rotation?

Any restrictions on skewing?

Any restrictions on mirroring?

Any restrictions on distortion of aspect ratio?

Other: This element is prohibited because SYMBOL LIBRARY LIST is prohibited.

4.10. Escape Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.21.1

Same as Model Profile: No;

 

ESCAPE

[v1]

References:

5.8.1

Element: Required No; Permitted Yes; Prohibited No;

List all registered ESCAPEs that are allowed:

  • ESCAPE 22, Transparent Cell Colour [v1/v2] metafiles only.
  • ESCAPE 45, Alpha Transparency: The SDR parameter is encoded as a real value between 0.0 and 1.0, inclusively, and applies to all subsequent graphical primitives.
  • ESCAPE 46, Symbol Background Enable: The SDR parameter is encoded as an integer value of 0 (disable) or 1 (enable) and controls whether the background of an instanced symbol is suppressed (0 - disable) or drawn (1 - enable). This escape is used in the instancing metafile, and refers to the treatment of the instanced symbol. Default is 0.
  • ESCAPE 47: Symbol Reference Point: This point is as an X and Y value in the VDC space of the symbol Picture in the Symbol Metafile. If the reference point is specified, the ESCAPE element shall appear in the Picture Descriptor area of the Symbol Library picture defining the symbol.
  • ESCAPE 48: Design height and width: The height and width are specified in the VDC units of the Symbol space. If the design parameters are specified, the ESCAPE element shall appear in the Picture Descriptor area of the symbol Library picture defining the symbol.

List all profile-defined ESCAPEs that are allowed and attach complete description:

Other: All ESCAPE element paramenters shall be encoded as SDRs

NOTE: Only registered ESCAPEs and profile-defined ESCAPEs shall be allowed in profiles.

Element: Required No; Permitted Yes; Prohibited No;

List all registered ESCAPEs that are allowed:

ESCAPE 22, Transparent Cell Colour [v1/v2] metafiles only.

 

List all profile-defined ESCAPEs that are allowed and attach complete description: None.

Other: None

4.11 External Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.22.1

Same as Model Profile: No

 

MESSAGE

[v1]

References:

5.9.1

Element: Required No; Permitted No; Prohibited Yes;

Values of the action required flag parameter:

  • 'action' Permitted No; Prohibited No;

(if permitted, specify the messages and actions taken)

  • 'no action' Permitted No; Prohibited No;

Any restrictions on the length of the message string, other than those for type SF parameter?

Other: None.

Element: Required No; Permitted Yes; Prohibited No;

Values of the action required flag parameter:

  • 'action' Permitted No; Prohibited Yes;

(if permitted, specify the messages and actions taken)

  • 'no action' Permitted Yes; Prohibited No;

Any restrictions on the length of the message string, other than those for SF parameter? None.

Other: None.

T.22.2

Same as Model Profile: No

 

APPLICATION DATA

[v1]

References:

5.9.2

Permitted No; Prohibited Yes;

Attach a syntactic and semantic description of all application data elements associated with this profile.

Other: None.

Element: Required No; Permitted Yes; Prohibited No;

The use of this element shall not be restricted.

Attach a syntactic and semantic description of all application data elements associated with this profile.

Other: None.

4.12 Segment Elements

Element

Specifications - W3C Web Profile

Specifications - Model Profile

T.23.1

Same as Model Profile: No

 

COPY SEGMENT

[v2]

References:

5.10.1

D.4.9.2

Element: Required No; Permitted No; Prohibited Yes;

Every segment identifier shall refer to a defined segment.

Any limits on the segment transformation application value?

Any restrictions on the nature of the transformation (e.g., permitting only isotropic transformations)?

Other:

Element: Required No; Permitted Yes; Prohibited No;

Every segment identifier shall refer to a defined segment.

Any limits on the segment transformation application value? None.

Any restrictions on the nature of the transformation (e.g., permitting only isotropic transformations)? Non-singular.

Other: None.

T.23.2

Same as Model Profile: No

 

INHERITANCE FILTER

[v2]

References:

5.10.2

Element: Required No; Permitted No; Prohibited Yes;

Any limits on the filter selection list?

Any limits on the selection setting?

Other:

Element: Required No; Permitted Yes; Prohibited No;

Any limits on the filter selection list? None.

An limits on the selection setting? None.

Other: None.

T.23.3

Same as Model Profile: No

 

CLIP INHERITANCE

[v2]

References:

5.10.3

D.4.9.2

Element: Required No; Permitted No; Prohibited Yes;

Any limits on the parameter?

Other:

Element: Required No; Permitted Yes; Prohibited No;

Any limits on the parameter? None.

Other: None.

T.23.4

Same as Model Profile: No

 

SEGMENT TRANS-
FORMATION

[v2]

References:

5.10.4

Element: Required No; Permitted No; Prohibited Yes;

Any restrictions on the nature of the transformation (e.g., permitting only isotropic transformations)?

Other:

Element: Required No; Permitted Yes; Prohibited No;

Any restrictions on the nature of the transformation (e.g., permitting only isotropic transformations)? Non-singular.

Other: None.

T.23.5

Same as Model Profile: No

 

SEGMENT HIGHLIGHTING

[v2]

References:

5.10.5

Element: Required No; Permitted No; Prohibited Yes;

Any restrictions on the parameter values?

Other:

Element: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? None.

Other: None.

T.23.6

Same as Model Profile: No

 

SEGMENT DISPLAY PRIORITY

[v2]

References:

5.10.6

Element: Required No; Permitted No; Prohibited Yes;

Any restrictions on the parameter values?

Other:

Element: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? None.

Other: None.

T.23.7

Same as Model Profile: No

 

SEGMENT PICK PRIORITY

[v2]

References:

5.10.7

Element: Required No; Permitted No; Prohibited Yes;

Any restrictions on the parameter values?

Other:

Element: Required No; Permitted Yes; Prohibited No;

Any restrictions on the parameter values? None.

Other: None.

4.13 Application Structure Elements

Functionality

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.24.1

Same as Model Profile: No

 

APPLICATION STRUCTURE ATTRIBUTE

[v4]

References:

4.9

5.9.3

Element: Required No; Permitted Yes; Prohibited No;

Define the set of structure elements for use within application structures, and attach complete syntactic and semantic description:

The set of attributes allowed are listed in Section 3 and are defined according to application structure type.

Other: None.

Element: Required No; Permitted Yes; Prohibited No;

Define the set of structure elements for use within application structures, and attach complete syntactic and semantic description:

None.

Other: None.

4.14 Generator Implementation Requirements

Functionality

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.25.1

Same as Model Profile: Yes

 

Colour requirements

References:

7.5.4.1

7.5.6.2.2

Colour mapping is: Permitted Yes; Prohibited No;

Reduction of the number of colours? Not specified.

NOTE - If mapping of application colours to metafile colour specifications is required, it is recommended that colour distance in the mapping be computed by the Euclidean metric in CIEXYZ space.

Definition of mapping algorithms, metrics, and colour space?

No specific colour mapping techniques or selection of metafile colour sets are defined.

For [v1/2] metafiles, implicit colour calibration specifications? No specifications are defined.

Other: None.

T.25.2

Same as Model Profile: Yes

 

Geometric accuracy and latitude

References:

7.5.6.2.1

Accuracy and latitude for mapping application graphics to CGM graphical primitive elements: Accuracy and latitude for mapping application graphics to CGM graphical primitive elements: Generators shall produce a metafile whose graphical primitive elements match the application graphical primitives accurately to within ±0.1% of relative position within the VDC Extent box or ±1/2 pixel of the intended size, whichever is greater. Generators shall produce geometric size aspects of the primitives (e.g., text size, line width, and edge width) to within 1% of the intended size or ±1/2 pixel of the intended size, whichever is greater.

This requirement shall apply to all graphical primitive elements, unless superseded by specific element requirements in this clause.

T.25.3

Same as Model Profile: Yes

 

Text accuracy and latitude

References:

7.5.6.2.3

Is text accuracy and latitude addressed? (yes/no) Yes.

If yes, specify. Metafile text specifications shall match the text of the application picture to within 1% of relative to the intended size or 1/2 pixel of the intended size, whichever is greater, for the placement and overall extent of each text string.

T.25.4

Same as Model Profile: No

 

Font substitution

References:

7.5.6.2.4

annex H

Font substitution is: Permitted Yes; Prohibited No;

Similarity of font visual characteristics? Substituted fonts shall be metrically equivalent or be controlled by the RESTRICTED TEXT element.

Font metrics? Record 7 of the graphics declaration file.

Individual glyph metrics? Specified in ISO/IEC 8632:1992 Amd 1:1994 Annex H for the core 13 fonts.

Other: None.

Font substitution is: Permitted Yes; Prohibited No;

Similarity of font visual characteristics? Substituted fonts shall have similar visual characteristics (e.g., posture, weight, proportionate width).

Font metrics? Specified in annex H.

Individual glyph metrics? Specified in annex H.

Other: None.

T.25.5

Same as Model Profile: Yes

 

Preservation of primitives

References:

7.5.6.3

Is preservation of graphical primitive elements addressed? (yes/no) No.

If yes, specify allowable substitutions.

T.25.6

Same as Model Profile: No

 

Semantic latitude

References:

7.5.6.4

Drawing priority and mode: Priority shall correspond to the metafile order (i.e., primitives occurring later in the file shall overlay primitives occurring earliest in the file). Mode shall be "replacement" mode.

Clipping: Clipping shall be to the intersection of the clip rectangle, the VDC EXTENT, the device viewport, and the device view surface limits.

Edge centreing: Edges shall be centred on the ideal mathematically-defined edge of the area

Meaning of predefined line types and edge types: See Section 4.18 about specific and generic line types.

Meaning of predefined hatch styles: See Section 4.19 about specific and generic hatch styles.

Other: None.

Drawing priority and mode: Priority shall correspond to the metafile order (i.e., primitives occurring later in the file shall overlay primitives occurring earliest in the file). Mode shall be "replacement" mode.

Clipping: Clipping shall be to the intersection of the clip rectangle, the VDC EXTENT, the device viewport, and the device view surface limits.

Edge centreing: Edges shall be centred on the ideal mathematically-defined edge of the area.

Meaning of predefined line types and edge types: The exact on-off definitions for the predefined line types and edge types are not specified.

Meaning of predefined hatch styles: The inter-line spacing is not specified. Use the latitudes of annex D.4.6.16 for the angular directions.

Other: None.

T.25.7

Same as Model Profile: Yes

 

Error processing

References:

7.5.6.5

Is error processing addressed? (yes/no) No.

If yes, specify the action taken.

Classification of error severity?

Requirements for error recovery?

Requirements for error reporting?

Additional areas?

Other: None.

T.25.8

Same as Model Profile: Yes

 

Reporting

References:

7.5.6.6

Is reporting required? (yes/no) No.

If yes, specify the action taken.

Method and format of the reporting?

  • Requirement to report substitution, error, fallback behaviour, mappings, or other behaviors?

Additional areas?

Other: None.

T.25.9

Same as Model Profile: Yes

 

Degeneracies

References:

7.5.6.7

7.5.4.4

D.2

D.4

Is the generation of degenerate primitives addressed? (yes/no) No. The generation of degenerate primitives is not restricted.

If yes, attach specifications.

Other: None.

4.15 Interpreter Implementation Requirements

Functionality

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.26.1

Same as Model Profile: Yes

 

Number of pictures

References:

7.5.7.2

T.13.2

If 0 pictures are permitted (see T.13.2), describe the interpreter behaviour: Prohibited by T.13.2.

T.26.2

Same as Model Profile: Yes

 

Empty pictures

References:

7.5.7.3

T.13.3

If permitted (see T.13.3), interpreter behavior: The graphical effect shall be one picture in the background colour.

T.26.3

Same as Model Profile: Yes

 

Colour requirements

References:

7.5.4.1

7.5.7.4.2

7.5.4.5

Interpreters shall be classified as either monochrome, greyscale, or colour interpreters (depending on the colour capability of the interpreter), and shall meet the criteria in attachment 25.4

Conversions between different colour models shall be according to the conversions in annex G.

Mapping of metafile colour to device components? If mapping (to fewer colour, or greyscale, or monochrome) is required for RGB metafiles, the recommendations of annex D.3.2 shall be used.

For [v1/2] metafiles, implicit colour calibration specifications? No specifications are defined.

Other: None.

T.26.4

Same as Model Profile: Yes

 

Geometric accuracy and latitude

References:

7.5.7.4.1

Accuracy and latitude for placement and realization of geometric aspects when geometric primitive elements are rendered. Interpreters shall render graphical primitive elements accurately to within ± 0.1% of relative position within the VDC Extent box or ±1/2 of the pixel resolution of the output device, whichever is greater. Interpreters shall render the geometric size aspect of primitives (e.g., text size, line width, and edge width) to within 1% of the intended size or ±1/2 pixel of resolution of the output device, whichever is greater.

This requirement shall apply to all graphical primitive elements, unless superseded by specific element requirements in this clause.

T.26.5

Same as Model Profile: Yes

 

Text rendering

References:

7.5.7.4.3

T.26.3

Is text accuracy and latitude addressed? (yes/no) Yes.

If yes, specify. Interpreter-rendered text shall match the text specification of the metafile to within 1% relative to the intended size or ±1/2 pixel of resolution of the output device, whichever is greater, for the placement and overall extent of each text string.

Is precision of text rendering is addressed? (yes/no) Yes.

If yes, specify interpreter action. Interpreters shall render text using 'stroke' precision, regardless of the actual value of the TEXT PRECISION of the metafile.

T.26.6

Same as Model Profile: No

 

Font substitution

References:

T.16.13

7.5.7.4.4

annex H

Font substitution is: Permitted Yes; Prohibited No;

If prohibited, use the font as specified in the FONT LIST.

If permitted, include a reference set of font and glyph metrics which correspond to the canonical instances of the substitutable font. See the FONT LIST element and annex H.

Are substitution methods, latitudes, and constraints addressed? (yes/no)

No

If yes, specify:

Similarity of font visual characteristics? Substituted fonts shall be metrically equivalent or be controlled by the RESTRICTED TEXT element.

Font metrics? Substituted fonts shall have similar metrics to the fonts specified in the metafile.

Individual glyph metrics? Specified in ISO/TEC 8632:1992 Amd.I:1994 Annex H for the core thirteen fonts.

Additional areas? None.

Other: None.

Font substitution is: Permitted Yes; Prohibited No;

If prohibited, use the font as specified in the FONT LIST.

If permitted, include a reference set of font and glyph metrics which correspond to the canonical instances of the substitutable font. See the FONT LIST element and annex H.

Are substitution methods, latitudes, and constraints addressed? (yes/no) Yes. If yes, specify:

Similarity of font visual characteristics? Substituted fonts shall have similar visual characteristics to the fonts specified in the metafile

Font metrics? Substituted fonts shall have similar metrics to the fonts specified in the metafile.

Individual glyph metrics? As specified in annex H.

Additional areas? None.

Other: None.

T.26.7

Same as Model Profile: No

 

Semantic latitude

References:

7.5.7.5

T.20.37

T.20.38

T.20.39

T.20.42

T.20.44

T.20.45

T.20.46

Drawing priority and mode: Priority shall correspond to the metafile order (i.e., primitives occurring later in the file shall overlay primitives occurring earliest in the file. Mode shall be "replacement" mode.)

View surface clearing at picture start: Surface will be cleared upon the occurrence of BEGIN PICTURE BODY, except as specified elsewhere in this profile.

Clipping: When CLIP INDICATOR is 'off', clipping shall be to the intersection of the device viewport and the device view surface limits. When CLIP INDICATOR is 'on', clipping shall be to the intersection of the clip rectangle, the VDC EXTENT, the device viewport, and the device view surface limits

Edge centreing: Edges shall be centred on the ideal mathematically-defined edge of the area.

Meaning of predefined line types and edge types: See Section 4.18 about specific and generic line types.

Meaning of predefined hatch styles: See Section 4.19 about specific and generic hatch styles.

(CGM:1992 defect correction 1/63 has inserted this specification:)

In the absence of a LINE/MARKER/TEXT CLIPPING MODE element, the interpreter treatment of LINE/MARKER/TEXT CLIPPING MODE shall be (check one):

In the style of one specific parameter value, from the set of standardized values. YES. Specify which one: SHAPE

In the style of any of the specific parameter values, from the set of standardized values. NO

For [v1/v2] metafiles, text restriction method for RESTRICTED TEXT elements, chosen from the set of standard and registered styles of the RESTRICTED TEXT TYPE element: Value 2.

For [v1/2] metafiles, interpreter treatment of the 2 aspects of line cap shall be either:

  • in the style of one specific parameter value pair from the set of standard and registered values (excluding values 1) of the LINE CAP element. No Values = ?
  • in the style of any parameter value pair from the set of standard and registered values (excluding values 1) of the LINE CAP element. Yes

For [v1/2] metafiles, interpreter treatment of the 2 aspects of edge cap shall be either:

  • in the style of one specific parameter value pair, from the set of standard and registered values (excluding values 1) of the EDGE CAP element. No Values = ?
  • in the style of any parameter value pair, from the set of standard and registered values (excluding values 1) of the EDGE CAP element. Yes

For [v1/2] metafiles, interpreter treatment of line join shall be either:

  • in the style of one specific parameter value, from the set of No

Drawing priority and mode: Priority shall correspond to the metafile order (i.e., primitives occurring later in the file shall overlay primitives occurring earliest in the file. Mode shall be "replacement" mode.)

View surface clearing at picture start: Surface will be cleared upon the occurrence of BEGIN PICTURE BODY.

Clipping: When CLIP INDICATOR is 'off', clipping shall be to the intersection of the device viewport and the device view surface limits. When CLIP INDICATOR is 'on', clipping shall be to the intersection of the clip rectangle, the VDC EXTENT, the device viewport, and the device view surface limits.

Edge centering: Edges shall be centred on the ideal mathematically-defined edge of the area.

Meaning of predefined line types and edge types: The exact on-off definitions for the predefined line types and edge types are not specified.

Meaning of predefined hatch styles: The inter-line spacing is not specified. Use the latitudes of annex D.4.6.16 for the angular directions.

















For [v1/v2] metafiles, text restriction method for RESTRICTED TEXT elements, chosen from the set of standard and registered styles of the RESTRICTED TEXT TYPE element: Value 2.

For [v1/2] metafiles, interpreter treatment of the 2 aspects of line cap shall be either:

  • in the style of one specific parameter value pair from the set of standard and registered values (excluding values 1) of the LINE CAP element. No Values = ?
  • in the style of any parameter value pair from the set of standard and registered values (excluding values 1) of the LINE CAP element. Yes

For [v1/2] metafiles, interpreter treatment of the 2 aspects of edge cap shall be either:

  • in the style of one specific parameter value pair, from the set of standard and registered values (excluding values 1) of the EDGE CAP element. No Values = ?
  • in the style of any parameter value pair, from the set of standard and registered values (excluding values 1) of the EDGE CAP element. Yes

For [v1/2] metafiles, interpreter treatment of line join shall be either:

  • No; in the style of one specific parameter value, from the set of

T.26.7 continued

Semantic latitude

T.26.7 continued

Semantic latitude

  • in the style of one specific parameter value, from the set of standard and registered values (excluding value 1) of the LINE JOIN element. No Value = ?
  • in the style of any parameter value, from the set of standard and registered values (excluding value 1) of the LINE JOIN element. Yes

For [v1/2] metafiles, interpreter treatment of edge join shall be either:

  • in the style of one specific parameter value, from the set of standard and registered values (excluding value 1) of the EDGE JOIN element. No Value = ?
  • in the style of any parameter value, from the set of standard and registered values (excluding value 1) of the EDGE JOIN element. Yes

For [v1/2] metafiles, interpreter treatment of line type continuation shall be either:

  • in the style of one specific parameter value, from the set of standard and registered values (excluding value 1) of the LINE TYPE CONTINUATION element. No Value = ?
  • in the style of any parameter value, from the set of standard and registered values (excluding value 1) of the LINE TYPE CONTINUATION element. Yes

For [v1/2] metafiles, interpreter treatment of edge type continuation shall be either:

  • in the style of one specific parameter value, from the set of standard and registered values (excluding value 1) of the EDGE TYPE CONTINUATION element. No Value = ?
  • in the style of any parameter value, from the set of standard and registered values (excluding value 1) of the EDGE TYPE CONTINUATION element. Yes

Other:

  • in the style of one specific parameter value, from the set of standard and registered values (excluding value 1) of the LINE JOIN element. No Value = ?
  • in the style of any parameter value, from the set of standard and registered values (excluding value 1) of the LINE JOIN element. Yes

For [v1/2] metafiles, interpreter treatment of edge join shall be either:

  • in the style of one specific parameter value, from the set of standard and registered values (excluding value 1) of the EDGE JOIN element. No Value = ?
  • in the style of any parameter value, from the set of standard and registered values (excluding value 1) of the EDGE JOIN element. Yes

For [v1/2] metafiles, interpreter treatment of line type continuation shall be either:

  • No; in the style of one specific parameter value, from the set of standard and registered values (excluding value 1) of the LINE TYPE CONTINUATION element. Value = ?
  • Yes; in the style of any parameter value, from the set of standard and registered values (excluding value 1) of the LINE TYPE CONTINUATION element.

For [v1/2] metafiles, interpreter treatment of edge type continuation shall be either:

  • in the style of one specific parameter value, from the set of standard and registered values (excluding value 1) of the EDGE TYPE CONTINUATION element. No Value = ?
  • in the style of any parameter value, from the set of standard and registered values (excluding value 1) of the EDGE TYPE CONTINUATION element. Yes

Other: None.

T.26.8

Same as Model Profile: Yes

 

Error processing

References:

7.5.7.6

Is error processing addressed? (yes/no) No.

If yes, specify the action taken.

Classification of error severity?

Requirements for error recovery?

Requirements for error reporting?

Additional areas?

Other: None.

T.26.9

Same as Model Profile: Yes

 

Reporting

References:

7.5.7.7

Is reporting required? (yes/no) No.

If yes, specify the action taken.

Method and format of the reporting?

Requirement to report any substitution, error, fallback behaviour, mappings, or other behaviors?

Additional areas?

Other: None.

T.26.10

Same as Model Profile: Yes

 

Degeneracies

References:

7.5.7.8

7.5.4.4

D.2

D.4

Is the interpretation of degenerate primitives addressed? (yes/no) Yes.

If yes, for each primitive, specify the degeneracy including its source (i.e., intrinsic or computational). Intrinsically degenerate primitives shall be rendered as specified in annex D subsections: D.2.2, D.2.3, D.4.5.4 through D.4.5.8, D.4.5.11, and D.4.5.12. Interpreters are not required to detect computational degeneracy. If interpreters do detect computational degeneracies, they shall be rendered as specified in annex D subsections: D.2.2, D.2.3, D.4.5.4 through D.4.5.8, D.4.5.11, and D.4.5.12

Other: None.

Attachment 26.4

Colour requirements, Model Profile:

The colour mapping step (CMS) and colour rendering step (CRS) for each class of interpreters is as follows:

  • monochrome:
    CMS
    all foreground information is mapped to one colour, background information to another colour.
    CRS
    all foreground information is mapped to one colour, background information to another colour.
  • greyscale:
    CMS
    32 grey levels, the recommendations of annex D.3.2 is used to map colour to grey.
    CRS
    a unique representation of each of the levels of grey.
  • full colour:
    CMS
    5R,9G,5B grid of RGB colour cube, plus a 32 grey levels (0-1), some of which are already on the grid.
    CRS
    a unique representation of all the "colours".

4.16 Binary Encoding Rules

4.16.1 Delimiter Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.12.1

Same as Model Profile: Yes

 

NOOP

[v1]

References:

7.2

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? None.

Other: None.

4.16.2 Metafile Descriptor Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.13.1

Same as Model Profile: No

 

INTEGER PRECISION

[v1]

References:

7.3

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? 16

Other: None.

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? 8, 16, or 32.

Other: None.

T.13.2

Same as Model Profile: Yes

 

REAL PRECISION

[v1]

References:

7.3

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value?(1, 16, 16) or (0, 9, 23).

Other: None.

T.13.3

Same as Model Profile: No

 

INDEX PRECISION

[v1]

References:

7.3

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? 16

Other: None.

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? 8, 16, or 32.

Other: None.

T.13.4

Same as Model Profile: Yes

 

COLOUR PRECISION

[v1]

References:

7.3

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value?

8 or 16.

Other: None.

T.13.5

Same as Model Profile: Yes

 

COLOUR INDEX PRECISION

[v1]

References:

7.3

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value?

8 or 16.

Other: None.

T.13.6

Same as Model Profile: No

 

NAME PRECISION

[v2]

References:

7.3

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value?

8 or 16.

Other: None.

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value?

16 or 32.

Other: None.

4.16.3 Control Elements

Element

Specifications - W3C WebCGM Profile

Specifications - Model Profile

T.14.1

Same as Model Profile: Yes

 

VDC INTEGER PRECISION

[v1]

References:

7.5

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? 16 or 32.

Other: None.

T.14.2

Same as Model Profile: Yes

 

VDC REAL PRECISION

[v1]

References:

7.5

Element is: Required No; Permitted Yes;

Any restrictions on the parameter value? (1, 16, 16) or
(0, 9, 32).

Other: None.

4.17 Symbol Library

ISO/IEC 8632:1992 defines external symbol libraries to the extent that a list of symbol libraries can be defined in a metafile and symbols can be extracted from any library, scaled, slanted, rotated, and placed in a picture. The standard does not address the structure, semantics, syntax, or encoding of the symbol library itself. This profile defines a compliant external symbol library as a compliant metafile containing one or more pictures. Each symbol in the symbol library metafile is stored as a picture. Symbol library metafiles meeting this specification can, in general, be exchanged independently from the metafiles which reference them.

4.17.1 Description

The correspondence between elements and their parameters in a symbol library metafile and elements and their parameters in the referencing metafile is as follows:

4.17.1.1 Begin Picture Identifier

The identifier parameter of each BEGIN PICTURE element in the symbol library metafile is the name of the symbol defined by the graphical primitive elements contained in that picture.

4.17.1.2 Symbol Referencing

The symbol index parameter of the POLYSYMBOL element in the referencing metafile is a positive integer which refers to the sequence of pictures in the symbol library metafile. For example, a symbol index of 3 would extract the third picture (symbol) in the library specified by the current SYMBOL LIBRARY INDEX, dimension it according to SYMBOL SIZE, orient it according to SYMBOL ORIENTATION, and display it according to the current SYMBOL COLOUR. The default behavior of the symbol picture background shall be "transparent" upon the instantiation of a symbol instance.

4.17.1.3 Symbol Origin Point

Unless specified by an ESCAPE element with an identifier parameter of 47 the origin of the VDC space of the referenced picture in the symbol library metafile is placed at each point in the position point list parameter of the POLYSYMBOL element in the referencing metafile. If there is more than one position point in the position point list, one instance of the symbol will be placed at each point.

4.17.1.4 Symbol Design Height and Width

Unless specified by an ESCAPE element with an identifier parameter of 48 the design width and the design height parameters of a symbol are the width and height of the VDC EXTENT space.

4.17.2 Extents

Graphic content of the symbols must be restricted to the rectangular area specified by VDC EXTENT or to the extents specified by the origin and design width and height as specified by ESCAPE elements.

4.17.3 Inheritance

The behavior of inheritance of context and attributes fall into two categories; syntax context and graphical context.

4.17.3.1 Graphical Context

The interpreter shall respect the syntax context of the symbol library metafile. This means that the interpreter must save the current syntax context of the referencing metafile, assume the context of the symbol metafile, render the symbol, and restore the saved referencing metafile context.

4.17.3.2 Inheritance Behavior

The rules for the behavior of graphical context inheritance are determined by three factors; the existence of a default behavior in ISO/IEC 8632, an explicit definition in the referencing metafile, and an explicit definition in the symbol metafile. The

following table defines these rules:

Existence of a CGM default behavior

Existence of an explicit definition in the referencing metafile

Existence of an explicit definition in the symbol metafile

Ruling authority in the determination of graphical context

Yes

Yes

Yes

Symbol Metafile

Yes

Yes

No

CGM default behavior

Yes

No

Yes

Symbol Metafile

Yes

No

No

CGM default behavior

No

Yes

Yes

Symbol Metafile

No

Yes

No

Referencing Metafile

No

No

Yes

Symbol Metafile

No

No

No

Referencing Metafile

4.18 Line and Edge Style Definitions

WebCGM supports both generic, but imprecise line types, and specific, precise line types. The realizations of line types 1..5 are described in general terms in the CGM standard (e.g., "dash-dot-dot"), and the realizations and constraints of the registered line types 6..15 are described in the ISO Register of Graphical Items (e.g., requirements for inking vertexes in certain engineering line types). Otherwise, the exact line patterns of implicit line types 1..15 are unconstrained. Where exact realizations of line types are expected and required, the LINE AND EDGE TYPE DEFINITION element should be used.

4.19 Hatch Style Definitions

WebCGM supports both generic, but imprecise hatch styles, and specific, precise hatch styles. The realizations of hatch styles 1..6 are described in general terms in the CGM standard. Otherwise, the exact hatch patterns of implicit hatch styles 1..6 are unconstrained. Where exact realizations of hatch styles are expected and required, the HATCH STYLE DEFINITION element should be used.

4.20 Markers and Symbols

WebCGM supports both generic, but imprecise polymarkers, and specific, polymarkers. The realizations of polymarkers 1..5 are described in general terms in the CGM standard. Otherwise, the exact polymarkers of implicit polymarkers 1..5 are unconstrained. Where exact realizations of polymarkers are expected and required, the POLYSYMBOL element should be used with the symbol library mechanism described in section 4.17.

4.21 JPEG Compression within the Tile Element

This profile allows the use of JPEG restricted to the TILE element. The method is limited to BASELINE JPEG. BASELINE JPEG conforms to the process required for all DCT-based decoders. The colour selection mode of the TILE element shall always be direct, independent of the COLOUR SELECTION MODE in effect in the CGM. The cell colour precision parameter of the TILE shall always be 8-bit for BASELINE JPEG. The COLOUR model of the TILE element shall be defined in the method specific parameters element of the TILE. It can be the same or independent of the COLOUR MODEL of the CGM. BASELINE JPEG shall assume that the order of the spectral bands is the same order given by the colour model as defined by the method specific parameters. For example, if the model is RGB, each scan will compress the red component, followed by the green component, followed by the blue component. For the case where the colour model is "RGB related", the specific colour model shall be defined in the method specific parameters of the TILE element. The method specific parameters shall be present for each image compressed using BASELINE JPEG. The parameters shall be encoded as an SDR. The JPEG colour model parameter is required and is specified according to the rules of the INDEX PRECISION element. Valid values are:

Values outside the range of 0-5 are not allowed. The JPEG colour submodel is required only when the JPEG colour model is "RGB related" and is specified according to the rules of the INDEX PRECISION ELEMENT. Valid values are:

Other values are not allowed.


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