Hi Michael & Florent

Thank you for your answers.

Florent, would you be kind enough to explain the function.

>       <xsl:function name="k:get-source" as="xs:string">
>         <xsl:param    name="node" as="node()"/>
>         <xsl:variable name="root" as="node()"
>                       select="root($node)"/>
>         <xsl:choose>
>           <xsl:when test="$root = $north">
>             <xsl:text>north</xsl:text>
>           </xsl:when>
>           <xsl:when test="$root = $south">
>             <xsl:text>south</xsl:text>
>           </xsl:when>
>           <xsl:when test="$root = $east">
>             <xsl:text>east</xsl:text>
>           </xsl:when>
>           <xsl:when test="$root = $west">
>             <xsl:text>west</xsl:text>
>           </xsl:when>
>           <xsl:otherwise>
>             <xsl:message terminate="yes">
>               <xsl:text>Unjnown source!</xsl:text>
>             </xsl:message>
>           </xsl:otherwise>
>         </xsl:choose>
>       </xsl:function>
> 


Thanks.

--
Kevin