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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Valid XML document
 Hi Steve, Steve said: It's not "valid" under XML 1.0 because you haven't included DTD definitions for <xsl:stylesheet>, <html>, or any of the other elements or attributes in the stylesheet. It shouldn't work for XSL because your DTD hasn't defined an ID attribute for <xsl:stylesheet>, and the <xsl:stylesheet> in this document doesn't have "Style" as its value of that ID attribute. So the fragment identifier "#Style" doesn't point to anything. Didier reply: You are right, the id attribute is missing in the stylesheet element. So the right document should be: > <?xml version="1.0" encoding="UTF-8" ?> > <!DOCTYPE greeting [ > <!ELEMENT test (xsl:stylesheet, greeting)> > <!ELEMENT greeting (#PCDATA)> > ]> > <?xml-stylesheet href="#Style" type="text/xsl"?> > <test> > <xsl:stylesheet version="1.0" > xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > id="Style"> > <html> > <title>this is a test</title> > <body><xsl:value-of select="//greeting"></body> > </html> > </xsl:stylesheet> > <greeting>Hello, world!</greeting> > </test> So, the document, to be valid in accordance to the xml 1.0 recommendation, and if we want to parse it with validation, would have to be like above. In the SGML world we would have > <!DOCTYPE greeting [ > <!ELEMENT test - - (xsl:stylesheet, greeting)> > <!ELEMENT greeting - - (#PCDATA)> > ]> > <?xml version="1.0" encoding="UTF-8" ?> > <?xml-stylesheet href="#Style" type="text/xsl"?> > <test> > <xsl:stylesheet version="1.0" > xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > id="Style"> > <html> > <title>this is a test</title> > <body><xsl:value-of select="//greeting"></body> > </html> > </xsl:stylesheet> > <greeting>Hello, world!</greeting> > </test> The difference is not big except that I would need to provide a declaration to the SGML parser so that the document could be parsed/validated. So the actual XML 1.0 recommendation consider that the scope of validation with a DTD is the whole document. As for SGML I cannot aggregate document fragment with their own structure definition in order to compose an aggregate document. "The whole has to be aware of the parts" he said with the tone of a disappointed person. If we would have an aggregation mechanism, the whole wouldn't need to be aware of the part and the document could still be parsed and validated. I guess that the XML world or the SGML world has to follow the same evolution as procedural languages did: a) phase 1: monolithic programs - monolithic documents b) phase 2: modular programs - modular documents A Possible evolution of the document specie: an object being the aggregation of behaviors and data structure. Behaviors are stand alone fragments with their own structure and validation process, data structure also. An object can be composed by aggregating both. Hoops, I went too far, we're not even at phase 2 yet. Slow down Didier :-)) Cheers Didier PH Martin mailto:martind@n... http://www.netfolder.com xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...) 
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