[xsl] Variable : string or temporary tree

["Siarhei Biarozkin" <sberyozkin@xxxxxxxxxx>]

Hello,
What is the best way to find out whether a variable is a string or a tree ?
For example, 

<xsl:variable name="cmdRequest" select='Z_ShowFile'> 
or
<xsl:variable name="cmdRequest"> 
  <request>Z_ShowFile</request>
  <request>Z_GetPips</request>
</xsl:variable>
As I'm new to XSLT, the only way I can think of is  :

<xsl:variable name="treeTest">
 <node> 
    <xsl:copy-of select="$cmdRequest"/>
 </node>
</xsl:variable> 
<xsl:choose>
  <xsl:when test="$treeTest/node/node()">
    <!-- $cmdRequest is a tree -->
  </xsl:when>
  <xsl:otherwise>
    <!-- $cmdRequest is a string -->
  </xsl:otherwise>
</xsl:choose>

Is there a shorter way to test it ?
Thank you
Siarhei Biarozkin


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