> Can I declare some variable like this and use it inside
>       <xsl:for-each select="o/com/$temp/*">?

No. As is the case with most programming languages, Xpath variables can
only hold values not fragments of expressions.

You can do

<xsl:for-each select="o/com/*/*">

or

<xsl:for-each select="o/com/*[nsmae()=$temp]/*">

David

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