Difference between revisions of "Prov-XML Identifiers"
From Provenance WG Wiki
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=== QName ===
=== QName ===
=== anyURI ===
Revision as of 19:08, 17 January 2013
Discussions on how to represent identifiers (prov:id) in PROV-XML
Options regarding the type of the prov:id and prov:ref xml attributes
Use xs:ID for prov:id and xs:IDRef for prov:ref
<xs:attribute name="id" type="xs:ID"/> <xs:attribute name="ref" type="xs:IDRef"/>
- 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.
- ID recognized by XML tools as an identifier type
- IDRef recognized by XML tools as a reference to an identified element
- ID uniqueness constraint (document scope only)
- IDRef must match some identified element in the document
- ID and IDRef cannot contain colons, whitespaces, or start with numbers
- URIs and qualified names are not valid IDs because both contain colons.
- Requiring unique IDs may cause problems with bundles