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Re: [xsl] Re: [xslt transform & grouping] Using the Muenchian Method?


Subject: Re: [xsl] Re: [xslt transform & grouping] Using the Muenchian Method?
From: "Michael PG" <xrow@xxxxxxx>
Date: Thu, 07 Oct 2004 12:59:02 +0000

Thanx!

In this example, where I only user Muenchian method to group, elements where info-attribute doesn't contains anything are also displayed, but not needed. How do I get rid of those elements here?


<?xml version='1.0' encoding='UTF-8'?>


<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

<xsl:key name="by-info" match="Article" use="@info"/>

<xsl:template match="/Documents">

<Documents>
<xsl:for-each select="Document/Article[count(.|key('by-info', @info)[1])=1]">
<Document name="{@info}">
<xsl:copy-of select="key('by-info', @info)"/>
</Document>
</xsl:for-each>
</Documents>


</xsl:template>

</xsl:stylesheet>

Thank you!

_m


From: David Carlisle <davidc@xxxxxxxxx>
Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: [xsl] Re: [xslt transform & grouping] Using the Muenchian Method?
Date: Thu, 7 Oct 2004 13:13:10 +0100


You get
$ saxon filter.xml filter.xsl
<?xml version="1.0" encoding="UTF-8"?>
<Documents>
   <Document name="sub">
      <Article title="1.1" info="sub" filter="food"/>
   </Document>
   <Document name="main">
      <Article title="1.2" info="main" filter="food"/>
      <Article title="2.2" info="main" filter="food"/>
   </Document>
   <Document name="child"/>
</Documents>

because of the different ways you filter.
on document you allow "" but in
<xsl:copy-of select="key('by-info',@info)[@filter=$filter]"/>
you don't.

I think that _is_ what you want, so in your for-each,

<xsl:for-each select="Document[@filter='' or
@filter=$filter]/Article[generate-id()=generate-id(key('by-info',@info)[@filter=''
or @filter=$filter])]">

you want to make sure that you always have at least one eleemnt in the
key that really has the filter value and not just "" so that
<xsl:copy-of select="key('by-info',@info)[@filter=$filter]"/>
always produces something.

you can do that by making the filters on the key() match,
delete     @filter='' or

<xsl:for-each select="Document[@filter='' or
@filter=$filter]/Article[generate-id()=generate-id(key('by-info',@info)[@filter=$filter])]">

and you get

$ saxon filter.xml filter.xsl
<?xml version="1.0" encoding="UTF-8"?>
<Documents>
   <Document name="sub">
      <Article title="1.1" info="sub" filter="food"/>
   </Document>
   <Document name="main">
      <Article title="1.2" info="main" filter="food"/>
      <Article title="2.2" info="main" filter="food"/>
   </Document>
</Documents>

David

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