PARSE REPEATING CHILD ELEMENTS IN NON-REPEATING PARENT NODE

Ashish Pandey

Total Post:128

Points:898
Posted by  Ashish Pandey
XML
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I have the following input xml and was wondering if XSLT can handle such transformation. If it can, how can it be achieve?

input xml:

<foo>
  <bar>
    <A>xxx</A>
    <B>yyy</B>
    <C>zzz</C>
    <A>aaa</A>
    <B>bbb</B>
    <C>ccc</C>
     ...
     ..
  </bar>
</foo>

output xml:

<data>
   <A>xxx</A>
   <B>yyy</B>
   <C>zzz</C>
</data>
<data>
   <A>aaa</A>
   <B>bbb</B>
   <C>ccc</C>
</data>
....

There could be more repeating A, B, C nodes in the example above. Since the repetition isn't in a repeating parent node, it's not possible to use for each. I was exploring the option of for-each-group but not sure if that is applicable. Would appreciate any advise.

  1. Jayden Bell

    Post:110

    Points:774
    Re: Parse repeating child elements in non-repeating parent node

    Using XSLT 1.0, following solution is working - tested with your example XML with 6 elements:

    <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" indent="yes"/>
    <xsl:template match="/*">
     <xsl:apply-templates select="/foo/bar"/>
    </xsl:template>
     
    <xsl:template match="bar">
     <xsl:for-each select="*/node()">
       <xsl:if test="(position()-1) mod(3) = 0">
        <data>
         <xsl:call-template  name="grouping">
          <xsl:with-param name="position" select="position()"/>
          <xsl:with-param name="amount" select="3"/>
         </xsl:call-template>
        </data>
       </xsl:if>
      </xsl:for-each>
    </xsl:template>
     
    <xsl:template  name="grouping">
    <xsl:param name="position" select="0"/>
    <xsl:param name="amount" select="0"/>
    <xsl:copy-of select="//bar/*[$position]"/>
       <xsl:if test="$amount > $position or   ($position mod(3) > 0)">
        <xsl:call-template  name="grouping">
          <xsl:with-param name="position" select="$position + 1"/>
          <xsl:with-param name="amount" select="$amount"/>
        </xsl:call-template>
       </xsl:if>
     </xsl:template>
    </xsl:stylesheet>

    Result:

    <?xml version="1.0" encoding="UTF-8"?>
    <data>
       <A>xxx</A>
       <B>yyy</B>
       <C>zzz</C>
    </data>
    <data>
       <A>aaa</A>
       <B>bbb</B>
       <C>ccc</C>
    </data>

    As short explanation - in the template matching "bar" all element-nodes are processed in

    <xsl:for-each select="*/node()">

    By using <xsl:if test="(position()-1) mod(3) = 0"> (which is 0 for the 1st node and for every 3rd node) the template named "grouping" is called to provide generating groups of 3 nodes. This template is called with the parameters  position - the position of the current node - and amount - the amount of nodes to be copied in each group.

      Modified On Apr-06-2018 04:47:07 AM

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