Ben Stover schrieb:
> Lets start with the following simplified piece of XSLT code :
>
> <xsl:template match="/">
>    ....
>   <moxx:someelement>
>       <xsl:value-of select="/moxx:aaa/moxx:bbb"/>
>   </moxx:someelement>
>   ....
>
> So when bbb is an optional element and it does NOT exist in the source
> XML then the following chunk is still created in the target XML doc:
>
> <moxx:someelement></moxx:someelement>
>
> How can I prevent the creation of these frame element tags when there
> is no source element?

You will want to learn about the difference between *pull* processing
(your pseudocode and Michael Kay's XSLT example and Martin's "verbose
way") and *push* processing (Martin's first suggestion, and my example
below).

Also, you will want to learn about the identity template, which is a
very common and important XSLT pattern, given below.

<xsl:stylesheet version="1.0"
   xmlns:moxx="net.moxx"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

   <xsl:template match="/">
     <moxx:root>
       <xsl:apply-templates select="moxx:aaa/moxx:bbb"/>
     </moxx:root>
   </xsl:template>

   <xsl:template match="moxx:bbb"><!-- or moxx:aaa/moxx:bbb
     for greater precision in matching -->
     <moxx:someelement>
       <xsl:apply-templates/>
     </moxx:someelement>
   </xsl:template>

   <xsl:template match="@*|node()"><!-- identity template -->
     <xsl:copy><xsl:apply-templates select="@*|node()"/></xsl:copy>
   </xsl:template>

</xsl:stylesheet>

Michael Ludwig

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