xslt - I need to remove dupilciate element that matches exactly -


i have input xml follows. target remove duplicate elements matches 1 another.

input xml

<namespaces> <namespace prefix="dc">http://purl.org/dc/elements/1.1/</namespace> <namespace prefix="gz">http://www.tso.co.uk/assets/namespace/gazette</namespace> <namespace prefix="xsl">http://www.w3.org/1999/xsl/transform</namespace> <namespace prefix="atom">http://www.w3.org/2005/atom</namespace> <namespace prefix="xd">http://www.oxygenxml.com/ns/doc/xsl</namespace>  <namespace prefix="xs">http://www.w3.org/2001/xmlschema</namespace> <namespace prefix="xhtml">http://www.w3.org/1999/xhtml</namespace> <namespace prefix="atom">http://www.w3.org/2005/atom</namespace> <namespace prefix="xd">http://www.oxygenxml.com/ns/doc/xsl</namespace> <namespace prefix="xs">http://www.w3.org/2001/xmlschema</namespace> <namespace prefix="xhtml">http://www.w3.org/1999/xhtml</namespace> <namespace prefix="atom">http://www.w3.org/2005/atom</namespace> <namespace prefix="xs">http://www.w3.org/2001/xmlschema</namespace> <namespace prefix="gz">http://www.tso.co.uk/assets/namespace/gazette</namespace> <namespace prefix="gz">http://www.tso.co.uk/assets/namespace/gazette</namespace> </namespaces>

and expected output[from above input xml snippet] should follows:

<namespaces> <namespace prefix="dc">http://purl.org/dc/elements/1.1/</namespace> <namespace prefix="gz">http://www.tso.co.uk/assets/namespace/gazette</namespace> <namespace prefix="xsl">http://www.w3.org/1999/xsl/transform</namespace> <namespace prefix="atom">http://www.w3.org/2005/atom</namespace> <namespace prefix="xd">http://www.oxygenxml.com/ns/doc/xsl</namespace>  <namespace prefix="xs">http://www.w3.org/2001/xmlschema</namespace> <namespace prefix="xhtml">http://www.w3.org/1999/xhtml</namespace> <namespace prefix="gz">http://www.tso.co.uk/assets/namespace/gazette</namespace> </namespaces>

i need xslt code achieve this. idea? please

this can interpreted grouping problem - want group elements based on combination of prefix attribute , string value, , retain first element in each group. in xslt 2.0 simple for-each-group

<xsl:template match="namespaces">   <namespaces>     <xsl:for-each-group select="namespace" group-by="concat(@prefix, ':', .)">       <xsl:sequence select="." />     </xsl:for-each-group>   </namespaces> </xsl:template>

in xslt 1.0 can define key , use muenchian technique

<xsl:key name="nskey" match="namespace" use="concat(@prefix, ':', .)" />  <xsl:template match="namespaces">   <namespaces>     <xsl:copy-of select="namespace[        generate-id() = generate-id(key('nskey', concat(@prefix, ':', .))[1])]" />   </namespaces> </xsl:template>

(this assumes have 1 namespaces element in document, if have more 1 technique still works need more complex key including generate-id(..) produce groups per-parent rather per-document).


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