Collaborative messaging framework is this xsl code correct

Summary:

I m passing a yes no variable from data model having values either Y or N. In xsl file I want to ececute different conditions based on Y or N value. But the logic is failing. Can you help check if the code is correct

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<!-- GEINC17826811 start -->

<xsl:variable name='Display_Disc_Per'>
<xsl:apply-templates select="tns:TransferDocLineExtAttr">
<xsl:with-param name="attrCode" select="'Display_Disc_Per'"/>
</xsl:apply-templates>