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xmlxsltxslt-2.0exslt

Remove second node with same id in xslt

I need to remove some node whith same ID in a xml file using XSLT 2.0. The structure is:

<Root>
  <media tipo="immagine" id="1">
    <numero>14.1</numero>
  </media>
  <media tipo="immagine" id="2">
    <numero>14.2</numero>
  </media>
  <media tipo="immagine" id="1">
    <numero>14.1</numero>
  </media>
</Root>

and the result must be:

<Root>
  <media tipo="immagine" id="1">
    <numero>14.1</numero>
  </media>
  <media tipo="immagine" id="2">
    <numero>14.2</numero>
  </media>
</Root>

I have multiple with the same attribute ID value. Thanks

Solution

  • Assuming the id is all you want to compare and check use

    <xsl:key name="by-id" match="*" use="@id"/>

<xsl:template match="@* | node()">
  <xsl:copy>
    <xsl:apply-templates select="@* | node()"/>
  </xsl:copy>
</xsl:template>

<xsl:template match="*[@id and not(. is key('by-id', @id)[1])]"/>