Re: XSL Transformation

Hi Jim,

> I've trying to work on this XSL transformation but I am running into
> a wall. Can some help me get started?

OK. There are two steps to this:

1. A way of quickly going from a letter (e.g. 'C') to all the <row>
elements whose Keyword attribute starts with that letter.

2. A way of stepping through the alphabet one letter at a time, and
for each letter generating a <Keyword> element, with the appropriate
<Term> elements inside it (retrieved through the mechanism from step
1).

Step 1 can be achieved with a key. Write a key that indexes the <row>
elements by the first letter in their Keyword attribute. Keys are
created with <xsl:key>. You can get the first letter of a string with
the substring() function.

Step 2 needs a recursive template. You start off with the whole
alphabet and step through one letter at a time until there are no
letters left. The basic form of such a template is:

<xsl:template name="...">
  <xsl:param name="alphabet" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'" />
  <xsl:if test="$alphabet">
    <xsl:variable name="letter" select="substring($alphabet, 1, 1)" />
    ...
    <xsl:call-template name="...">
      <xsl:with-param name="alphabet"
                      select="substring($alphabet, 2)" />
    </xsl:call-template>
  </xsl:if>
</xsl:template>

Within this template, you need to get the relevant <row> elements
using the key that you've created. You can do this with the key()
function.

Is that enough to get you started? If you have more questions, let us
know...

Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/


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