Ben Stover wrote:
> 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?
> 
> In pseudo code I need something like
> 
> <xsl:template match="/">
>    ....
>   "if /moxx:aaa/moxx:bbb exists" then (
>   <moxx:someelement>
>       <xsl:value-of select="/moxx:aaa/moxx:bbb"/>
>   </moxx:someelement>)
>   ....
> 
> How can I code this in XSLT ?

If you have

   <xsl:template match="moxx:aaa/moxx:bbb">
     <moxx:someelement>
       <xsl:value-of select="."/>
     </<moxx:someelement>>
   </xsl:template>

and make sure that elements are processed (which for instance the 
built-in templates will do) then you have achieved what you want.

Obviously the verbose way
   <xsl:if test="/moxx:aaa/moxx:bbb">
     <moxx:someelement>
       <xsl:value-of select="/moxx:aaa/moxx:bbb"/>
     </<moxx:someelement>
   </xsl:if>
is also possible.

-- 

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/

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