Prov-XML Identifiers
From Provenance WG Wiki
(Difference between revisions)
(→xs:ID/xs:IDRef) |
(→Using xs:ID for prov:id and xs:IDRef for prov:ref) |
||
| Line 6: | Line 6: | ||
=== Using xs:ID for prov:id and xs:IDRef for prov:ref === | === Using xs:ID for prov:id and xs:IDRef for prov:ref === | ||
| + | |||
| + | ==== Contraints ==== | ||
'''Validity constraint: ID''' | '''Validity constraint: ID''' | ||
| Line 23: | Line 25: | ||
Values of type IDREF must match the Name production, and values of type IDREFS must match Names; each Name must match the value of an ID attribute on some element in the XML document; i.e. IDREF values must match the value of some ID attribute. | Values of type IDREF must match the Name production, and values of type IDREFS must match Names; each Name must match the value of an ID attribute on some element in the XML document; i.e. IDREF values must match the value of some ID attribute. | ||
| - | Advantages: | + | ==== Advantages ==== |
| - | # | + | |
| + | # xs:ID recognized by XML tools as an identifier type | ||
| + | # xs:IDRef recognized by XML tools as a reference to an identified element | ||
| + | |||
| + | ==== Disadvantages === | ||
| - | |||
# ID and IDRef have a base type of NCName | # ID and IDRef have a base type of NCName | ||
## cannot contain colons, whitespaces, or start with numbers | ## cannot contain colons, whitespaces, or start with numbers | ||
## URIs and qualified names are not valid IDs because both contain colons. | ## URIs and qualified names are not valid IDs because both contain colons. | ||
| - | |||
| - | |||
| - | |||
| - | |||
=== xs:QName/xs:QName === | === xs:QName/xs:QName === | ||
=== xs:anyURI/xs:anyURI === | === xs:anyURI/xs:anyURI === | ||
Revision as of 18:56, 17 January 2013
Discussions on how to represent identifiers (prov:id) in PROV-XML
Contents |
Options regarding the type of the prov:id and prov:ref xml attributes
Using xs:ID for prov:id and xs:IDRef for prov:ref
Contraints
Validity constraint: ID
Values of type ID must match the Name production. A name must not appear more than once in an XML document as a value of this type; i.e., ID values must uniquely identify the elements which bear them.
Validity constraint: One ID per Element Type
No element type may have more than one ID attribute specified.
Validity constraint: ID Attribute Default
An ID attribute must have a declared default of #IMPLIED or #REQUIRED.
Validity constraint: IDREF
Values of type IDREF must match the Name production, and values of type IDREFS must match Names; each Name must match the value of an ID attribute on some element in the XML document; i.e. IDREF values must match the value of some ID attribute.
Advantages
- xs:ID recognized by XML tools as an identifier type
- xs:IDRef recognized by XML tools as a reference to an identified element
= Disadvantages
- ID and IDRef have a base type of NCName
- cannot contain colons, whitespaces, or start with numbers
- URIs and qualified names are not valid IDs because both contain colons.
