xsl:variable within xsl:choose. Why doesn't that work?

Hi XSL-ers,

Why doesn't this work and what can I do about it?
(I know I can use xsl:value-of instead of the xsl:variable, but I need de aVar later)

<xsl:choose>
	<xsl:when test="do a test">
		<xsl:variable name="aVar" select="when var"/>
	</xsl:when>
	<xsl:otherwise>
		<xsl:variable name="aVar" select="otherwise var"/>
	</xsl:otherwise>
</xsl:choose>

<xsl:value-of select="$aVar"/>

Greetings Rene
   { @   @ }
        ^
      \__/

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