[xsl] XSL1.0 can I define a nodeset as var?

["shi wudao" <shiwudao@xxxxxxxxxxx>]

Hi, Guru
I have a quesiton, how can I define a var, it's value is a nodeset. 
Like "select path1" "select path2" below.  Thank you.
<xsl:variable name="mynodeset">
 <xsl:choose>
   <xsl:when test="case1"> select path1  </xsl:when>
   <xsl:when test="case2"> select path2  </xsl:when>
 </xsl:choose>
</xsl:variable>

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