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So for any kind of node (as those three patterns describe all types of nodes) the template says <xsl:apply-templates select="@*|node()"/> which means process the union of the attribute nodes and...
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Muenchian grouping (or Muenchian method, named after Steve Muench) is an algorithm for grouping of data used in XSL Transformations v1 that identifies keys in the results and then queries all nodes with that key.
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