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RE: Not a nested for loop.

Subject: RE: Not a nested for loop.
From: "Michael Kay" <michael.h.kay@xxxxxxxxxxxx>
Date: Wed, 16 Jan 2002 14:59:21 -0000
nested for loops
> I have a main document,
> form is:
>          <r id="d0e170156">
>               <bibno>079732</bibno>
>               <cat-num>10400</cat-num>
>               <TBcategory>General fiction</TBcategory>
>               <id>079732*RNIB*</id>
>               <num-cassettes>1</num-cassettes>
>               <play-time>08:47</play-time>
>               <rdr-gender>F</rdr-gender>
>               <rearch-date/>
>          </r>
> And an external file, form is:
>  <bk>
>       <n>2</n>
>       <t>THE CAR MAKERS</t>
>    </bk>
>    <bk>
>       <n>3</n>
>       <t>WYATT'S HURRICANE</t>
>    </bk>
>    <bk>
>       <n>4</n>
>       <t>THE RELUCTANT WIDOW</t>
>    </bk>
>    <bk>
> I need to loop through each of the main input document
> records (r elements)
>  and if r/cat-num is any one of the values of the external file, /bk/n
> then I need to copy the r element and contents through to the output.
> Can xslt2.0 help with this form of filtering?

The XSLT 1.0 solution is

<xsl:copy-of select="r[cat-num = document('ext.xml')/bk/n]"/>

and this continues to work in XSLT 2.0.

What XSLT 2.0 (or XPath 2.0) gives you is the ability to extend this to do a
join that isn't a pure equijoin. For example if you want to do a case-blind
comparison you can now write:

<xsl:copy-of select="r[some $c in document('ext.xml')/bk/n
                       satisfies upper($c)=upper(cat-num)]"/>

Joins other than equijoins weren't in general possible in XPath 1.0, you had
to code them yourself using nested loops at the XSLT level.

Mike Kay

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

Current Thread
  • Not a nested for loop.
    • DPawson - Wed, 16 Jan 2002 08:59:41 -0500 (EST)
      • Jeni Tennison - Wed, 16 Jan 2002 09:26:39 -0500 (EST)
      • Michael Kay - Wed, 16 Jan 2002 09:58:23 -0500 (EST) <=
      • <Possible follow-ups>
      • DPawson - Wed, 16 Jan 2002 10:27:24 -0500 (EST)


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