I want to assign a node-set returned by key() to a variable.

This works fine : <xsl:variable name="foo" select="key('XXX', YYY)"/>

But now I have a condition and I have to use <xsl:choose>.

And in such case I am not able to set the variable.
The pseudo for what I want is something like this:
<xsl:variable name="foo">
 <xsl:choose>
    <xsl:when test="SOME-TEST">
         SELECT node-set returned by key('XXX', YYY)
    </xsl:when>
    <xsl:otherwise>
          SELECT node-set ancestor::*[1]
    <xsl:otherwise>
 </xsl:choose>
</xsl:variable>

Any suggesstions?

<xsl:variable name="foo" select="key('XXX',YYY)[SOME-TEST] |
                                 ancestor::*[1][not(SOME-TEST)]"/>

<xsl:variable name="test" select="SOME-TEST"/>
<xsl:variable name="foo" select="key('XXX',YYY)[$test] |
                                 ancestor::*[1][not($test)]"/>

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