<xsl:key name = 'test' match = 'Book' use =
"/testcase/BooksAuthors/BookAuthor[@bookid =
current()/@bookid]/@authorid"/>

I think it has been reported before that MSXML4 isn't initializing
current() when evaluating the use expression of xsl:key. I think that's
a bug. 

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx 

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx 
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Bill Cohagan
> Sent: 14 June 2002 17:05
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Semantics of xsl:key (MSXML4 broken?)
> 
> 
> I've got an xsl:key definition that works fine on Saxon 
> 6.5.2, works on Xalan, but does not work on MSXML4SP1. In 
> fact the original XSLT code actually caused MSXML to crash 
> although the "testcase" version just doesn't work properly.
> 
> The problem I'm trying to solve is to take an XML 
> representation of a relational many-to-many relationship and 
> define a SINGLE xsl:key that will map from one side of the 
> relationship to the other.  The testcase uses Authors and 
> Books, so I want to be able to define a key that when given 
> an authorid will produce the set of corresponding Book 
> elements. (Obviously in the real world we'd also like to go 
> the other way, but for testcase purposes I'll just deal with 
> one direction.)
> 
> Our solution uses an "unusual" use attribute on the xsl:key 
> definition, but if you interpret the spec the way I do then 
> it ought to work just fine. Apparently the Saxon and Xalan 
> authors *do* interpret the spec the way I do on this issue. 
> 
> I've had a brief interchange with a MS person on one of their 
> MSDN "moderated" groups, but he seemed to think that our 
> approach should NOT work, that the use attribute was somehow 
> restricted to *relative* path expression. In any case he 
> vanished before addressing any of my questions to him as to 
> why he and/or MS believed this to be the case.
> 
> What I'm looking for is some confirmation that the code 
> *ought* to work (as it in fact does in Saxon/Xalan) - or some 
> cogent argument as to why it should not; i.e., an explanation 
> of how the spec disallows this sort of thing.
> 
> Anyway, here's the testcase code, first the XML, then the 
> XSL, and finally the results, expected and actual.
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>XML>>>>>>>>>>>>>>>>>>>>>>
> <testcase>
>   <Authors>
>     <Author authorid = "1" name = "author 1"/>
>     <Author authorid = "2" name = "author 2"/>
>     <Author authorid = "3" name = "author 3"/>
>   </Authors>
>   <Books>
>     <Book bookid = "a" name = "book a"/>
>     <Book bookid = "b" name = "book b"/>
>     <Book bookid = "c" name = "book c"/>
>   </Books>
>   <BooksAuthors>
>     <BookAuthor bookauthorid = "x" bookid = "a" authorid = "1"/>
>     <BookAuthor bookauthorid = "y" bookid = "a" authorid = "2"/>
>     <BookAuthor bookauthorid = "z" bookid = "b" authorid = "1"/>
>     <BookAuthor bookauthorid = "w" bookid = "b" authorid = "3"/>
>   </BooksAuthors>
> </testcase>
> 
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>XSL>>>>>>>>>>>>>>>>>>>>>>
> <?xml version="1.0"?>
> <xsl:stylesheet version="1.0"
>         xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
> 
>   <xsl:output method="xml" omit-xml-declaration="yes" indent = "yes"/>
> 
>   <xsl:key name = 'test' match = 'Book' use = 
> "/testcase/BooksAuthors/BookAuthor[@bookid = 
> current()/@bookid]/@authorid"/>
> 
>   <xsl:template match = "/">
>     <TESTRESULT>
>       <xsl:for-each select = "key('test','1')">
>         <xsl:copy-of select = "."/>
>       </xsl:for-each>
>     </TESTRESULT>
>   </xsl:template>
> </xsl:stylesheet>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>SAXON RESULT>>>>>>>>>>>>>
> <TESTRESULT>
>    <Book bookid="a" name="book a"/>
>    <Book bookid="b" name="book b"/>
> </TESTRESULT>
> 
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>MSXML4 RESULT>>>>>>>>>>>>
> <TESTRESULT>
> </TESTRESULT>
> 
> Thanks in advance,
>  Bill  bill@xxxxxxxxxxxxxxxxxxxxx
> 
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