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Muenchian method, and keys 'n stuff

Subject: Muenchian method, and keys 'n stuff
From: DPawson@xxxxxxxxxxx
Date: Tue, 22 Jan 2002 12:56:15 -0000
muenchian method xalan
so far so good, but I'm missing a bit.

Source XML is a series of grouped records
            <au>Ashley, Bernard. </au>
multiple r records.

output requirement is to report, for each group (adventure)
all Authors beginning with, or (the hard bit)
to state
<p>There are no authors beginning with X </p>

stylesheet is:
<xsl:variable name="u" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'"/>
<xsl:variable name="l" select="'abcdefghijklmnopqrstuvwxyz'"/>
<xsl:key name="auth" 

  <xsl:template match="adventure">
    <!--   <xsl:for-each select="//l:letters/n">-->

    <xsl:apply-templates select="r[generate-id(.)=

Then for each r

<xsl:template match="r">
<xsl:variable name="thisAu" select="Ra/au"/>
  <h2>The letter <xsl:value-of select="translate(Ra/lett, $l,$u)"/> </h2>
  <h3><xsl:value-of select="Ra/au"/></h3>
 other stuff

    <xsl:apply-templates select="following-sibling::r[Ra/au = $thisAu ]" 


Which does the job for those records that *are* there.

I had to remove a for-each over an alphabet, because the contexts
were screwing me up. that was nice, I could call up each letter in turn...
but my brain gave up at that point.

I now have 
 <l:letters xmlns:l="local">
in the source document (its part 3 of a chain), to keep the key context
but I can't figure out a way of iterating over an alphabet,
and processing the records to 'announce' the missing letters (i.e. no books
beginning with that letter)

Any help appreciated.

Regards DaveP

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