<xsl:template name="DisplaySortedData">
    <xsl:for-each select="$customer/id">
        <xsl:call-template name="DisplayData" />
    </xsl:for-each>
</xsl:template>

<xsl:variable name="vipList" select="'1001|1002|1003|1004|1005|1006|1007|1008|1009|1010|1011|1012'"/>

<xsl:template name="DisplaySortedData">
    <xsl:variable name="vipList" select="'1001|1002|1003|1004|1005|1006|1007|1008|1009|1010|1011|1012'"/>
    <xsl:variable name="OptimizedIDs" select="'true'"/>
    <xsl:for-each select="$customer/id">
        <xsl:variable name="custID" select="@id"/>
        <xsl:choose>
            <xsl:when test="$OptimizedIDs='true' and contains(concat('|',$vipList,'|'),concat('|',$custID,'|'))">
                <xsl:call-template name="DisplayDataAsDropdown" />
            </xsl:when>
            <xsl:otherwise>
                <xsl:call-template name="DisplayData" />
            </xsl:otherwise>
        </xsl:choose>
    </xsl:for-each>
</xsl:template>