What is the difference between two given below codes? Both codes checks whether an attribute exists in a tag or not:

<xsl:choose>
  <xsl:when test="string-length(DBE:Attribute[@name='s0SelectedSite']/node()) &gt; 0"> 
    <table>
        ...
    </table>
  </xsl:when>
  <xsl:otherwise>
    <table>
        ...
    </table>
  </xsl:otherwise>
</xsl:choose>

and

<xsl:if test="@Col1-AllocValue"> 
    <xsl:copy-of select="@Col1-AllocValue"/>
</xsl:if>
xml xslt
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