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Re: [xsl] optimization choose - then same call-template

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Hello Hans,

there is one possibility, which is maybe more difficult to maintain, but is much shorter:

<xsl:value-of select="$title[$title != ''] | $title2['pseudocode: if second condition true'] | $title3['pseudo: if 3rd true'] | $default-value"/>

But there are some aspects:

1. The selected value will generally be the first in document order, not the first in the select statement. You won't get the hard and exclusive order of <xsl:choose/>, <xsl:when/>, <xsl:otherwise/>.

2. It will only work with node-sets, not with strings. So instead of testing on $title, you will need the expression used in your variable $title:

<xsl:value-of select="$pathNode[.=$df]/../@title[normalize-space()] | $expression2['pseudo: if true'] | $pathProperties/df[@name=$df]"/>

It's maybe a bit hard to understand. But you only have one <xsl:when/> in your example, so I can't give you a better example.

Of course instead of <xsl:value-of/> you can use <xsl:variable/>, but you will get all nodes, for which the evaluation is true. This means you always get the default node too. So you must change it a bit:

<xsl:variable name="title" select="(like select above)[1]"/>

Hope this helps a bit.
Regards,

Joerg

 <!-- the three parameters are inititialized from other template rule, which applies this rule for node df >
 <xsl:template match="df">
    <xsl:param name="pathNode"/>
    <xsl:param name="pathProperties"/>
    <xsl:param name="df" select="@name"/>
    <!-- select attribute title from xml-source with normalizing (delete)white-space-->
    <xsl:variable name="title" select="normalize-space($pathNode[.=$df]/../@title)"/>
    <xsl:choose>
      <!-- test if title from xml-source is not empty (exist and contains more than white-space)-->
      <xsl:when test="$title != '' "><!-- Label --><xsl:value-of select="$title"/>
      <xsl:call-template name="df">
          <!-- insert title from xml-source and pass parameters to generic template for generation of datafields -->
          <xsl:with-param name="thisTitle" select="$title"/>
          <xsl:with-param name="thisName" select="$df"/>
          <xsl:with-param name="thisPath" select="$pathNode[.=$df]/../."/>
          <xsl:with-param name="dfProperties" select="$pathProperties/df[@name=$df]"/>
        </xsl:call-template>
      </xsl:when>
      <!-- title from xml-properties -->
      <xsl:otherwise>
        <!-- Label --><xsl:value-of select="$pathProperties/df[@name=$df]"/>
        <xsl:call-template name="df">
          <!-- insert title from xml-properties and pass same parameters as above to generic template for generation of datafields -->
          <xsl:with-param name="thisTitle" select="$pathProperties/df[@name=$df]"/>
          <xsl:with-param name="thisName" select="$df"/>
          <xsl:with-param name="thisPath" select="$pathNode[.=$df]/../."/>
          <xsl:with-param name="dfProperties" select="$pathProperties/df[@name=$df]"/>
        </xsl:call-template>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

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