How should I go about doing this?
It's not clear where you found difficulty.
<xsl:function name="f">
<xsl:param name="x"/>
<xsl:variable name="y1">
.....
</xsl:variable>
<xsl:variable name="y2">
<xsl:apply-templates select="$y1"/>
</xsl:variable>
<xsl:sequence select="some-function-returning-a-list-of-strings($y2)"/>
</xsl:function>
David
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