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Recursive addition of attributes

In this example attributes are added to all elements. xsl:copyCopies the matching element node from the source document (without attribute and descendant nodes) and xsl:copy-of adds to these elements already existing attributes. The values of new attributes are set to the value of position() function and to the number of elements on "preceding-sibling::" axis. The values of these attributes always differ by one. If you understand the process of templates matching you know that it is not a coincidence.

XSLT

      <xsl:stylesheet
                  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                  version="2.0">
            <xsl:output  method="xml"
                        indent="yes"
                        omit-xml-declaration="yes"/>

            <xsl:template  match="*">
                  <xsl:copy>
                        <xsl:copy-of  select="@*"/>
                        <xsl:attribute  name="a"
                                    select="position()"/>
                        <xsl:attribute  name="z"
                                    select="count(preceding-sibling::*)"/>
                        <xsl:apply-templates  select="*"/>
                  </xsl:copy>
            </xsl:template>

      </xsl:stylesheet>
XML

      <aaa>
            <bbb  r="11"/>
            <ccc>
                  <ddd  r="7"
                              s="12"/>
                  <eee  r="3"
                              s="27"/>
            </ccc>
      </aaa>
Output

      <aaa  a="1"
                  z="0">
            <bbb  r="11"
                        a="1"
                        z="0"/>
            <ccc  a="2"
                        z="1">
                  <ddd  r="7"
                              s="12"
                              a="1"
                              z="0"/>
                  <eee  r="3"
                              s="27"
                              a="2"
                              z="1"/>
            </ccc>
      </aaa>


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