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copied!<p>To only check (and warn you of a duplicate), you may find an <a href="http://www.biglist.com/lists/lists.mulberrytech.com/xsl-list/archives/200807/msg00444.html" rel="nofollow noreferrer">example here</a></p> <p>Something along the lines of:</p> <pre><code><xsl:for-each-group select="collection(...)//@id" group-by="."> <xsl:if test="count(current-group()) ne 1"> <xsl:message>Id value <xsl:value-of select="current-grouping-key()"/> is duplicated in files <xsl:value-of select="current-group()/document-uri(/)" separator=" and "/></xsl:message> </xsl:if> </xsl:for-each-group> </code></pre> <p>To be modified to select all nodes within 'root' element.</p> <p>As to remove the duplicate lines, you have another <a href="http://graflex.org/klotz/weblog/2005/02/xslt-duplicate-elimination.html" rel="nofollow noreferrer">example here</a></p> <p>That would look like:</p> <pre><code><xsl:stylesheet> <xsl:key name="xyz" match="record[x/y/z]" use="x/y/z" /> <xsl:variable name="noxyzdups" select="/path/to/record[generate-id(.) = generate-id(key('xyz', x/y/z))]" /> ... <xsl:template ... > <xsl:copy-of "exslt:node-set($noxyzdups)" /> </xsl:template> </xsl:stylesheet> </code></pre> <p>x/y/z is the xpath expression that you want made unique. It can be concat(x,'-',@y,'-',z) or whatever you want. </p> <p>Now I am not sure those two examples can easily be adapted to your case, but I just wanted to point out those two sources, in case it helps.</p>

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