grouping for-each

I thought i might add an test example because i think it may help me to understand it a bit better:
<viewentries>
<viewentry><entrydata><text>ghe</text></entrydata></viewentry>
<viewentry><entrydata><text>aggj</text></entrydata></viewentry>
<viewentry><entrydata><text>bab</text></entrydata></viewentry>
<viewentry><entrydata><text>corry</text></entrydata></viewentry>
<viewentry><entrydata><text>curry</text></entrydata></viewentry>
<viewentry><entrydata><text>don</text></entrydata></viewentry>
<viewentry><entrydata><text>din</text></entrydata></viewentry>
<viewentry><entrydata><text>eat</text></entrydata></viewentry>
<viewentry><entrydata><text>carry</text></entrydata></viewentry>
<viewentry><entrydata><text>edd</text></entrydata></viewentry>
<viewentry><entrydata><text>abbl</text></entrydata></viewentry>
<viewentry><entrydata><text>ebdads</text></entrydata></viewentry>
<viewentry><entrydata><text>ettf</text></entrydata></viewentry>
<viewentry><entrydata><text>full</text></entrydata></viewentry>
<viewentry><entrydata><text>geik</text></entrydata></viewentry>
</viewentries>

<xsl:key name="ve-by-firstocc" match="viewentry" use="substring(entrydata/text,1,1)" />
<xsl:template match="viewentries">
<xsl:for-each select="viewentry[count(. | key('ve-by-firstocc', substring(entrydata/text,1,1))[1]) = 1]">
<xsl:sort select="substring(entrydata/text,1,1)" data-type="text" order="ascending"/>
<xsl:variable name="firstletter" select="substring(entrydata/text,1,1)" />
<xsl:value-of select="substring(entrydata/text,1,1)"/>
<xsl:for-each select="key('ve-by-firstocc', substring(entrydata/text,1,1))">
<xsl:sort select="entrydata/text" data-type="text" order="ascending"/>
<xsl:value-of select="entrydata/text" />
</xsl:for-each>
</xsl:for-each>
</xsl:template>

how would it loop through the viewentries for bothe for each staements?

From: "james walker" <jameswalkerandy@xxxxxxxxxxx>
Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  Interpretaion of grouping for-each
Date: Tue, 04 Nov 2003 10:24:03 +0000

What does count() =1 represent (got a bit confused about jeni's explanation)
"and

count(. | .....) =1
id the currently selected viewdata is that first element.
so

"
Just to be clear, am i right in saying that "viewentry{key('ve-by-firstocc', substring(entrydata[3]/text,1,1))[1]]" selects the first of each group of viewentries with the same key (including groups which only have one viewentry in it)?

From: David Carlisle <davidc@xxxxxxxxx>
Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  Interpretaion of grouping for-each
Date: Mon, 3 Nov 2003 17:02:29 GMT

> Does it go through viewentries which have dont have repeat key values?

No it selects the first (in document order) viewentry with each key
value (even if that key value is not repeated).

See any description of muenchian grouping, eg Jeni's site.

<xsl:for-each select="viewentry
that selects all viewentries then
key('ve-by-firstocc', substring(entrydata[3]/text,1,1))
selects al the entries with the same key,
so
key('ve-by-firstocc', substring(entrydata[3]/text,1,1))[1]
selects the first of that group
and
count(. | .....) =1
id the currently selected viewdata is that first element.
so
viewentry[....]
just selects the first entry in each group as teh predicate is false in
other case.

David

--
http://www.dcarlisle.demon.co.uk/matthew

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