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thanks Re: multi-level grouping trouble
> That's a little bit astray. You're actually after *i elements*
> (again). And you want the *i elements* whose own unique ID is the
> same as the first i element returned from the key when you access it
> with a key value being the composite s concatenated with u (with a
> space separator).
Sigh, that's what I get for not reviewing everything carefully after
deciding to match on <i> again (at first, I was trying to match on
<s> for the second pass, before realising that that wasn't such a hot
idea because it made it tougher to use the previous constraint).
> key('i_by_s', s)[generate-id() =
> generate-id(key('i_by_su',
> concat(s, ' ', u))[1])]/s
>
> Or you could apply templates to the i elements in a different mode.
> That's what I would usually do.
This was probably my biggest problem, not making use of mode. Thanks
for pointing that out -- mode makes the problem much simpler.
> One more thing - is there any reason that you're wrapping an
> xsl:for-each around an xsl:apply-templates like this:
>
> <xsl:for-each select="i[generate-id(.) =
> generate-id(key('i_by_s',s)[1])]">
> <xsl:sort select="s"/>
> <xsl:apply-templates select="."/>
> </xsl:for-each>
The reason is that I had forgotten that <xsl:sort> can be used with
<xsl:apply-templates>, so I was doing it manually. :-)
> > I am willing to use saxon:intersection, since I'm already using
> > saxon:preview just to be able to create the input data in the first
> > place.
>
> Well you may want to use saxon:hasSameNodes() rather than using
> generate-id() to test node equality. For example:
>
> i[saxon:hasSameNodes(., key('i_by_s', s)[1])]
>
> I hope that helps,
>
> Jeni
Yes, quite a bit, thank you. Here's the working code that I ended up
after reading your suggestions:
<?xml version="1.0" encoding="US-ASCII"?>
<xsl:transform
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:saxon="http://icl.com/saxon";
exclude-result-prefixes="saxon">
<xsl:output
method="xml"
indent="yes"
encoding="US-ASCII"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"/>
<xsl:key
name="i_by_s"
match="i"
use="s"/>
<xsl:key
name="i_by_su"
match="i"
use="concat(s,' ',u)"/>
<xsl:template match="root">
<html>
<body>
<table border="2">
<xsl:apply-templates
select="i[generate-id(.) =
generate-id(key('i_by_s', s)[1])]"
mode="i_by_s">
<xsl:sort select="s"/>
</xsl:apply-templates>
</table>
</body>
</html>
</xsl:template>
<xsl:template match="i" mode="i_by_s">
<tr><td>Standard name: <xsl:value-of select="s"/></td></tr>
<xsl:apply-templates
select="key('i_by_s',s)[generate-id(.) =
generate-id(key('i_by_su', concat(s,'
',u))[1])]"
mode="i_by_su">
<xsl:sort select="e"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="i" mode="i_by_su">
<tr><td>Used name: <xsl:value-of select="u"/></td></tr>
<xsl:apply-templates
select="key('i_by_su', concat(s,' ',u))"
mode="render_content">
<xsl:sort select="e"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="i" mode="render_content">
<tr>
<td>
<xsl:text>e_id </xsl:text>
<xsl:value-of select="e/@id"/>
</td>
</tr>
</xsl:template>
</xsl:transform>
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