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Can anyone help me on making a condition statement if a url-parameter called ‘$labels’ is populated or not. Thanks in advance

<xsl:choose>
    <xsl:when test="$labels != ''">
        <!-- it is set -->
    </xsl:when>
    <xsl:otherwise>
        <!-- it is not set -->
    </xsl:otherwise>
</xsl:choose>

Awesome!

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