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copied!<p>This is easily solved with an <code><xsl:key></code>:</p> <pre><code><xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > <xsl:output method="text" /> <xsl:key name="kRole" match="ROLE" use="@name" /> <xsl:template match="ROLE"> <xsl:value-of select="concat(@name, ' ')" /> <xsl:value-of select="count( (. | preceding-sibling::ROLE)[ count(. | key('kRole', @name)[1]) = 1 ])" /> </xsl:template> </xsl:stylesheet> </code></pre> <p>Output is as desired:</p> <pre><code>TESTER 1 PARENT1 2 PARENT1 2 PARENT1 2 PARENT2 3 PARENT2 3 PARENT3 4 PARENT4 5 TESTROLE 6 </code></pre> <p>Explanation of the XPath expression in the <code><xsl:value-of></code>:</p> <pre><code>count( # count the nodes: (. | preceding-sibling::ROLE) # union of this node and its predecessors [ # where... count( # the count of the union of... . | # this node and key('kRole', @name)[1] # the first node with the same @name ) = 1 # is 1 ] ) </code></pre> <p>This is the Muenchian method. Based on the fact that a node set cannot contain the same node twice, a union of two nodes has a node count of 1 if they are the same node. This way we are selecting the unique nodes from <code>(. | preceding-sibling::ROLE)</code> only.</p> <p>If there are more than one <code><ROLEACTIONINFO></code> elements in your document, there is a parent check missing. This is also easily achieved:</p> <pre><code> <xsl:template match="ROLE"> <xsl:variable name="parentId" select="generate-id(..)" /> <xsl:value-of select="count( (. | preceding-sibling::ROLE)[ count(. | key('kRole', @name)[generate-id(..) = $parentId][1]) = 1 ])" /> </xsl:template> </code></pre> <p>Note that <code>[generate-id(..) = $parentId][1]</code> != <code>[1][generate-id(..) = $parentId]</code>. </p> <p>Order is important when chaining predicates. The former checks for parent node equality first and then takes the first unique node from the reduced set. This is what we want. </p> <p>The latter takes the first node from the set (all ROLE nodes with a given name throughout the document), takes the first one and then keeps or discards it based on parent equality. This is wrong.</p>

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