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

["Costello, Roger L." <costello@mitre.org>]

Dave Pawson pointed me to a web page [1] that appears to answer my
question:

By default, Jing enforces the constraints imposed by RELAX NG DTD
Compatibility with respect to ID/IDREF/IDREFS.

What is "RELAX NG DTD Compatibility"?  The Guidelines document that I
referenced in my first posting says this:

[DTD Compatibility] defines the concept of an ID-type, which is an
additional semantic for datatypes that allows datatypes to have [XML
1.0] cross-reference semantics. An implementation of [DTD
Compatibility] that supports these guidelines should associate the ID,
IDREF and IDREFS datatypes of [W3C XML Schema Datatypes] with the
ID-types ID, IDREF, and IDREFS respectively.

So I conclude that, unless otherwise specified, a Relax NG validator
will treat ID and IDREF values the same way that XML treats them, i.e.
an IDREF value must reference an ID value.

/Roger

[1] http://www.thaiopensource.com/relaxng/jing.html

-----Original Message-----
From: Len Bullard [mailto:len.bullard@uai.com] 
Sent: Thursday, November 15, 2007 10:47 AM
To: Costello, Roger L.; xml-dev@lists.xml.org
Subject: 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.

len


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.

QUESTION #1

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
Datatypes].

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