Re: [xsl] Re: retrieve data from #1 xml via data from #2 xml (again)

[Jeni Tennison <mail@xxxxxxxxxxxxxxxx>]

Hi Walter,

> OK, here is my XSLT file.

Thanks. This shows that my guess was miraculously close. I'll try to
explain it again...

You have a template that matches an interaction_list. Within that
template, you have an xsl:apply-templates instruction:

<xsl:template match='callEvent/response/interaction_list'>
   ...
   <!-- This will loop for each Interaction in this data stream -->
   <!-- This calls the ROOT NODE Template below -->
   <xsl:apply-templates />
   ...
</xsl:template>

(Those are your comments, BTW.)

Now, when you use xsl:apply-templates without a select attribute, the
XSLT processor will apply templates to all the child nodes of the
current node. In the context of this template, the current node is an
interaction_list element. The children of the interaction_list element
include a number of interaction elements. So templates are applied to
those interaction elements (3 of them). The processor finds the
template to match interaction elements, this one:

<xsl:template match='interaction'>
   <xsl:for-each select="$data">
      <tr>
         <xsl:variable name="datum" select="events/call_event" />
         <xsl:for-each select="$columns">
            <xsl:variable name="column" select="." />
            <td>
               <xsl:value-of select="$datum/*[name() = $column]" />
            </td>
         </xsl:for-each>
      </tr>
   </xsl:for-each>
</xsl:template>

In this template, the xsl:for-each tells the processor to iterate over
a number of nodes - the interaction elements held by the $data
variable. So your stylesheet runs this template three times, and the
content of the xsl:for-each is run three times as well. Or if you have
four interaction elements, then the template is run four times; and
the xsl:for-each runs the instructions it contains four times.

So essentially you're doing the iteration over twice, once through
applying templates to the interaction elements; once by iterating over
them with an xsl:for-each.

To solve the problem, just remove the xsl:for-each to make it:

<xsl:template match='interaction'>
   <tr>
      <xsl:variable name="datum" select="events/call_event" />
      <xsl:for-each select="$columns">
         <xsl:variable name="column" select="." />
         <td>
            <xsl:value-of select="$datum/*[name() = $column]" />
         </td>
      </xsl:for-each>
   </tr>
</xsl:template>

I hope that helps,

Jeni

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



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