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test-group.xsl
test-group-m.xsl
test-group.xml
output.xml
output-m.xml
test-group.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:template match="/booklist"> <authors> <xsl:call-template name="RecursiveGrouping"> <xsl:with-param name="list" select="book"></xsl:with-param> </xsl:call-template> </authors> </xsl:template> <xsl:template name="RecursiveGrouping"> <xsl:param name="list"></xsl:param> <!-- Selecting the first author name as group identifier and the group itself--> <xsl:variable name="group-identifier" select="$list[1]/@author"></xsl:variable> <xsl:variable name="group" select="$list[@author=$group-identifier]"></xsl:variable> <!-- Do some work for the group --> <author name="{$group-identifier}" number-of-books="{count($group)}"></author> <!-- If there are other groups left, calls itself --> <xsl:if test="count($list)>count($group)"> <xsl:call-template name="RecursiveGrouping"> <xsl:with-param name="list" select="$list[not(@author=$group-identifier)]"></xsl:with-param> </xsl:call-template> </xsl:if> </xsl:template> </xsl:stylesheet>
test-group-m.xsl
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:key name="author" match="@author" use="."></xsl:key> <xsl:template match="/booklist"> <authors> <xsl:apply-templates select="book[generate-id(@author) = generate-id(key('author', @author))]"></xsl:apply-templates> </authors> </xsl:template> <xsl:template match="book"> <xsl:variable name="count" select="count(following-sibling::book[@author = current()/@author])"></xsl:variable> <author name="{@author}" number-of-books="{$count + 1}"></author> </xsl:template> </xsl:stylesheet>
test-group.xml
<booklist> <book author="Frank Herbert" title="Dune"></book> <book author="Roberto Quaglia" title="Bread, Butter and Paradoxine"></book> <book author="Kate Wilhelm" title="Where Late the Sweet Bird Sang"></book> <book author="Anthony Burgess" title="A Clockwork Orange"></book> <book author="Frank Herbert" title="Dragon in the Sea"></book> <book author="Anthony Burgess" title="Earthly Powers"></book> <book author="Isaak Asimov" title="The Foundation Trilogy"></book> <book author="Frank Herbert" title="Children of Dune"></book> <book author="Isaak Asimov" title="The Caves of Steel"></book> </booklist>
output.xml
<authors><author name="Frank Herbert" number-of-books="3"></author><author name="Roberto Quaglia" number-of-books="1"></author><author name="Kate Wilhelm" number-of-books="1"></author><author name="Anthony Burgess" number-of-books="2"></author><author name="Isaak Asimov" number-of-books="2"></author></authors>
output-m.xml
<authors><author name="Frank Herbert" number-of-books="3"></author><author name="Roberto Quaglia" number-of-books="1"></author><author name="Kate Wilhelm" number-of-books="1"></author><author name="Anthony Burgess" number-of-books="2"></author><author name="Isaak Asimov" number-of-books="2"></author></authors>