> So how can I create the element <SubConcepts> below <Top> and not 
> <PrimeConcept> ?

just move it there in the stylesheet, what's the problem?

incidentally

                <xsl:element name="SubConcept">
                    <xsl:attribute name="id"><xsl:value-of 
select="@id"/></xsl:attribute>
                    <xsl:attribute name="name"><xsl:value-of 
select="@name"/></xsl:attribute>
                </xsl:element>

is a very long way of writing

                <SubConcept id="{@id}" name="{@name"/>

David


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