Core Attributes, id and xml:id

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Core Attributes, id and xml:id

Chris Lilley

Hello public-tt,

lists the Core Attributes as id, xml:lang, xml:space

Given the difficulty of determining that an id is of type ID in the absence of a DTD or Schema, and given that external DTD subsets are optional in XML 1.0 and 1.1, and given that xml:id is intended precisely to provide an unambiguous ID attribute, could you please explain why the Core Attributes are not

xml:id, xml:lang, xml:space ?
xml:id Version 1.0
W3C Recommendation 9 September 2005

 Chris Lilley                    mailto:[hidden email]
 Interaction Domain Leader
 Co-Chair, W3C SVG Working Group
 W3C Graphics Activity Lead
 Co-Chair, W3C Hypertext CG