I have this XML code snippet and I need to check if it is empty:
<CNPJ>
<xsl:if "cnpjContratado"!=NULL>
<xsl:value-of select="cnpjContratado"/>
</xsl:if>
</CNPJ>
<CPF>
<xsl:if "cpfContratado"!=NULL>
<xsl:value-of select="cpfContratado"/>
</xsl:if>
</CPF>