Difference between revisions of "TF-RDF-XML"

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(Task Force "RDF-XML")
(Change 5: datatyped empty literals)
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This is believed by several developers and former WG-members to be an omission in the grammar defined by the RDF/XML Syntax Specification: a bug was reported (and acknowledged by the editor), relating to the use of an rdf:datatype attribute on empty RDF properties. See the archived mailing list thread for technical details. In addition to the question of the RDF/XML grammar's syntactic completeness, note that this issue identifies a construct that occurs within RDF graphs that cannot be serialized in the RDF/XML syntax.  
 
This is believed by several developers and former WG-members to be an omission in the grammar defined by the RDF/XML Syntax Specification: a bug was reported (and acknowledged by the editor), relating to the use of an rdf:datatype attribute on empty RDF properties. See the archived mailing list thread for technical details. In addition to the question of the RDF/XML grammar's syntactic completeness, note that this issue identifies a construct that occurs within RDF graphs that cannot be serialized in the RDF/XML syntax.  
  
'''proposal:'''
+
'''current state:'''
 
  <nowiki>
 
  <nowiki>
 
Current section "7.2.16 Production literalPropertyElt" says
 
Current section "7.2.16 Production literalPropertyElt" says
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rdf:RDF | rdf:ID | rdf:about | rdf:parseType | rdf:resource | rdf:nodeID | rdf:datatype
 
rdf:RDF | rdf:ID | rdf:about | rdf:parseType | rdf:resource | rdf:nodeID | rdf:datatype
 
(...)
 
(...)
 +
</nowiki>
  
 
+
'''proposed change:'''
My understanding here is that we could change section 7.2.21 this way:
+
<nowiki>
 
+
 
7.2.21 Production emptyPropertyElt
 
7.2.21 Production emptyPropertyElt
 
start-element(URI == propertyElementURIs ),
 
start-element(URI == propertyElementURIs ),

Revision as of 11:00, 30 October 2012

Task Force "RDF-XML"

List of the changes considered for the RDF 1.1 XML Syntax Specification.

Changes include the Errata for RDF Syntax

Change 1: typo "tiple"

status:done.

initial erratum

Syntax typo “tiple” in 7.2.11 Production nodeElement: "and the following tiple is added to the graph"

Change 2: hard coded reference to XML and Unicode versions

status: done.

initial erratum

Hard coded reference to XML 1.0 and to Unicode 3.0 are unduly restrictive. Both reference should be exchanged against a normative reference to the generically latest versions of both standards.

Change 3: signature resolve(e, s)

status: done.

initial erratum

Section 6.3.3 Grammar Action Notation of the RDF/XML Syntax Specification defines the resolve action with the signature resolve(e, s), i.e. taking two arguments, and yet we find the following:

in 7.2.11 Production nodeElement

u:=uri(identifier:=resolve(a.string-value))

in 7.2.21 Production emptyPropertyElt

u:=uri(identifier:=resolve(a.string-value))

while both should read:

u:=uri(identifier:=resolve(e, a.string-value))

Change 4: missing parent accessor

status: done.

initial erratum Section 6 of the RDF/XML Syntax Specification (Revised) says that the parent property of the element information item in the XML Infoset is required, but section 6.1.2 Element Event does not create a parent accessor for that event. Element events therefore do not have a parent accessor, and yet a parent accessor on element events is made use of in a number or sections. See the error submission for further details.

Change 5: datatyped empty literals

status: open.

inital erratum with email 1 and email 2

Serialization of datatyped empty literals is not anticipated by the RDF/XML grammar. This is believed by several developers and former WG-members to be an omission in the grammar defined by the RDF/XML Syntax Specification: a bug was reported (and acknowledged by the editor), relating to the use of an rdf:datatype attribute on empty RDF properties. See the archived mailing list thread for technical details. In addition to the question of the RDF/XML grammar's syntactic completeness, note that this issue identifies a construct that occurs within RDF graphs that cannot be serialized in the RDF/XML syntax.

current state:

Current section "7.2.16 Production literalPropertyElt" says
start-element(URI == propertyElementURIs ), attributes == set(idAttr?, datatypeAttr?))
text()
end-element()
Note that the empty literal case is defined in production emptyPropertyElt.
(...)

Current section "7.2.21 Production emptyPropertyElt" says
start-element(URI == propertyElementURIs ),
    attributes == set(idAttr?, ( resourceAttr | nodeIdAttr )?, propertyAttr*))
end-element()
(...)

with section "7.2.7 Production propertyAttributeURIs" specifying and
anyURI - ( coreSyntaxTerms | rdf:Description | rdf:li | oldTerms )
(...)

with section "7.2.2 Production coreSyntaxTerms" including datatypes:
rdf:RDF | rdf:ID | rdf:about | rdf:parseType | rdf:resource | rdf:nodeID | rdf:datatype
(...)

proposed change:

7.2.21 Production emptyPropertyElt
start-element(URI == propertyElementURIs ),
    attributes == set(idAttr?, ( resourceAttr | nodeIdAttr | datatypeAttr)?, propertyAttr*))
end-element()