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Validation error: "Modularization of XHTML" Section E.4.1 example

From: Niranjan Kundapur <niranjan.kundapur@air2web.com>
Date: Wed, 20 Feb 2002 10:46:28 -0500 (EST)
Message-ID: <DF08E278E10FC14F87CE7E802ABFD04B76B609@EXCHANGE01.air2web.com>
To: "'www-html@w3.org'" <www-html@w3.org>
Hello,

I am trying to validate the example in Section E.4.1 in "Modularization of
XHTML"
(http://www.w3.org/TR/xhtml-modularization/dtd_developing.html#sec_E.4.1.) I
am using Xalan 2.3.0, which works with Xerces-Java 2.0.0. 

The error I get is as follows:
Error: Attribute "xmlns:simpleml" must be declared for element type "html".

Initially, I thought it might be a parser set-up problem, but now I think
otherwise. Anyways, my parsing code is included below. 

Investigating XHTML Qname Module xhtml-qname-1.mod (relevant section
included below), I noticed the following:
a) Since %XHTML.prefixed; is IGNORE, %XHTML.xmlns.attrib; is "xmlns
%URI.datatype; #FIXED '%XHTML.xmlns;' %XLINK.xmlns.attrib;" Therefore,
non-XHTML namespace declarations, which are declared by
%XHTML.xmlns.extra.attrib; and %NS.decl.attrib;, cannot be added. 
b) Setting %XHTML.prefixed; to INCLUDE leads to other validation errors
maybe because the XHTML elements in the E.4.1 example are not namespaced.

I worked around this problem by adding the following to the DTD driver
simpleml-1_0.dtd.

	<!ENTITY % NS.decl.attrib "xmlns:simpleml %URI.datatype; #FIXED
'http://www.example.com/xmlns/simpleml1'" >

	<!ENTITY % XHTML.xmlns "http://www.w3.org/1999/xhtml" >

	<!ENTITY % XLINK.xmlns.attrib "" >

	<!ENTITY % XHTML.xmlns.attrib
	   "%NS.decl.attrib;
	   xmlns %URI.datatype; #FIXED '%XHTML.xmlns;'
	   %XLINK.xmlns.attrib;"
	>


I will appreciate your clarification on whether there is a bug in the XHTML
Qname Module xhtml-qname-1.mod, or in the example, or in the parser setup. I
am inclined to believe that there is a bug in the XHTML Qname Module because
it is reasonable to define a grammar with elements in a non-XHTML namespace
and XHTML elements without prefix. I have included below a possible fix for
this. Basically, when %XHTML.prefixed; is IGNORE, the %NS.decl.attrib; takes
on the value "xmlns %URI.datatype; #FIXED '%XHTML.xmlns;'", in addition to
"%XHTML.xmlns.extra.attrib;". The %XHTML.xmlns.attrib; takes on the value
"%NS.decl.attrib; %XLINK.xmlns.attrib;" irrespective of the
%XHTML.prefixed;.

Thanks in advance for any clarification.

Regards, 
Niranjan



The parsing code:
------------------
//create DocumentBuilderFactory
	DocumentBuilderFactory m_dbf = DocumentBuilderFactory.newInstance();
// set various configuration options
	m_dbf.setValidating(true);
	m_dbf.setIgnoringComments(false);
	m_dbf.setIgnoringElementContentWhitespace(false);
	m_dbf.setCoalescing(false);
	m_dbf.setNamespaceAware(true);
// create a DocumentBuilder that satisfies the constraints
// specified by the DocumentBuilderFactory
	m_db = m_dbf.newDocumentBuilder();
// parse
	doc = m_db.parse(theInputSource);



Relevant section in XHTML QNames Module
---------------------------------------
<!ENTITY % XHTML.xmlns.extra.attrib "" >
<![%XHTML.prefixed;[
	<!ENTITY % NS.decl.attrib 
			"xmlns:%XHTML.prefix; %URI.datatype; #FIXED
'%XHTML.xmlns;' 
			%XHTML.xmlns.extra.attrib;">
]]>
<!ENTITY % NS.decl.attrib "%XHTML.xmlns.extra.attrib;" >

<!ENTITY % XLINK.xmlns.attrib "" >

<![%XHTML.prefixed;[
	<!ENTITY % XHTML.xmlns.attrib 
			"%NS.decl.attrib;
			%XLINK.xmlns.attrib;" >
]]>
<!ENTITY % XHTML.xmlns.attrib 
		"xmlns %URI.datatype; #FIXED '%XHTML.xmlns;' 
		%XLINK.xmlns.attrib;" >


A possible fix?
---------------
<!ENTITY % XHTML.xmlns.extra.attrib "" >
<![%XHTML.prefixed;[
	<!ENTITY % NS.decl.attrib 
			"xmlns:%XHTML.prefix; %URI.datatype; #FIXED
'%XHTML.xmlns;' 
			%XHTML.xmlns.extra.attrib;">
]]>
<!ENTITY % NS.decl.attrib 
		"%XHTML.xmlns.extra.attrib;
		xmlns %URI.datatype; #FIXED '%XHTML.xmlns;' " >

<!ENTITY % XLINK.xmlns.attrib "" >


<!ENTITY % XHTML.xmlns.attrib 
			"%NS.decl.attrib;
			%XLINK.xmlns.attrib;" >
Received on Wednesday, 20 February 2002 23:13:46 GMT

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