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RE: [xml-dev] 2 questions about Relax NG: ID/IDREF datatype and whitespace facet

The technical clarification will be interesting to read, but marketwise,
given that ID/IDREF checking has been provided since ISO 8879 SGML, not
validating that in a *validator* would be surprising even if not in the
lexical parse.  

Assert:  a tool can only be abstracted so far before it loses cohesion with
the original application and user base.  Don't shock the monkey.


From: Costello, Roger L. [mailto:costello@mitre.org] 
Hi Folks,

I am reading the "Guidelines for using W3C XML Schema Datatypes with
RELAX NG"[1], and am confused about a couple of things.


This paragraph in the Guidelines discusses the ID, IDREF datatypes:

The semantics defined by [W3C XML Schema Datatypes] for the ID, IDREF
and IDREFS datatypes are purely lexical and do not include the
cross-reference semantics of the corresponding [XML 1.0] datatypes. The
cross-reference semantics of these datatypes in XML Schema comes from
XML Schema Part 1. Furthermore, the [XML 1.0] cross-reference semantics
of these datatypes do not fit into the RELAX NG model of what a
datatype is. Therefore, RELAX NG validation will only validate the
lexical aspects of these datatypes as defined in [W3C XML Schema

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