Re: What is the correct DTD for XSL?
Earlier I wrote: > That raises the question: what is the correct DTD for XSL? Would it explicitly > include all the attributes of an <fo:block> in an <fo:inline-sequence> (plus a > great multitude of similarly situated attributes)? Or is the question of > validating an XSLT stylesheet as an XML document simply uninteresting to most > members of this community? James Tauber replied: > The DTD for an XSL stylesheet is completely dependent on the result tree > vocabulary. A stylesheet that results in XHTML would have one DTD, a > stylesheet that results in FOs would have another DTD, a stylesheet that > results in FOs with diagrams in SVG would have yet another DTD. > > The DTD for a FO result tree is less useful because you wouldn't normally > serialise the result tree. Your transformation engine would just give the > result tree to the formatter without serialising and having the formatter > have to reparse. John Simpson replied: > It's not uninteresting, simply or otherwise :), but the notion of > "validating an XSLT stylesheet" makes sense only if the result tree uses > XSL formatting objects. An overall DTD for XSL -- covering XSLT and the > formatting objects -- is possible, but the question is complicated by the > ability of XSLT to produce result trees in *non*-XSL vocabularies. What you > end up with in such a stylesheet contains elements and attributes from two > different DTDs. About the best you can do with this stylesheet is to test > it for well-formedness. (To my knowledge, there's not yet a validating > parser that's capable of validating against more than one DTD at a time. > For starters, what do you put in the document-type declaration?) > > So the answer isn't that it's uninteresting. The answer is that since many > (probably most) XSLT spreadsheets generate (X)HTML result trees, at least > so far, validation isn't even possible. I should have been clearer about what I meant by ``uninteresting'', namely, ``something you would hardly ever want to do''. As John said, ``validation isn't even possible''; as James said, ``The DTD for an XSL stylesheet is completely dependent on the result tree vocabulary''. That's what I had guessed, but I was hoping that someone would show me that validation in the XML sense is indeed possible and useful, i.e., there is a Santa Claus after all <s>. Paul Abrahams XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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