I knw its simple..but i struggling a bit

[smandape]

Hey experts, I am facing a problem which may be real easy for you. The XML code is as follows

<class_list>            <classification id="GO:0000287" class_type="GO">                <category>                    Molecular Function                </category>                <description>                    magnesium ion binding                </description>            </classification>            <classification id="GO:0004749" class_type="GO">                <category>                    Molecular Function                </category>                <description>                    ribose phosphate diphosphokinase activity                </description>            </classification>            <classification id="GO:0009165" class_type="GO">                <category>                    Biological Process                </category>                <description>                    nucleotide biosynthetic process                </description>            </classification>        </class_list>

I want to extract the 'description data and @id as follows

<Molecular_Function>     <GO_Id> GO:0000287 </GO_Id>    <description> magnesium ion binding </description>    <GO_Id> GO:0004749 </GO_Id>    <description> ribose phosphate diphosphokinase activity </description></Molecular_Function> <Biological Process>     <GO_Id> GO:0009165 </GO_Id>    <description> nucleotide biosynthetic process</description></Biological Process>

can I use the code something as follows:

<field name="GO_Biological_process"> <xsl:for-each select="class_list/classification[category='Biological Process']/description">            <xsl:value-of select="."/>             </xsl:for-each>            </field>

I know something is wrong, but could you please help to solve this..i greatly appreciate your help.thank you,sammed

[Martin Honnen]

It is a grouping problem that can be solved with XSLT 2.0 as follows:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"><xsl:output indent="yes"/><xsl:template match="@* | node()">  <xsl:copy>	<xsl:apply-templates select="@*, node()"/>  </xsl:copy></xsl:template><xsl:template match="class_list">  <xsl:copy>	<xsl:for-each-group select="classification" group-by="normalize-space(category)">	  <xsl:element name="{translate(current-grouping-key(), ' ', '_')}">		<xsl:apply-templates select="current-group()"/>	  </xsl:element>	</xsl:for-each-group>  </xsl:copy></xsl:template><xsl:template match="classification">  <xsl:apply-templates select="@id, description"/></xsl:template><xsl:template match="classification/@id">  <GO_Id><xsl:value-of select="."/></GO_Id></xsl:template></xsl:stylesheet>