Question

Input xml :

<Root>
    <RootHeader>Header</RootHeader>
    <Reference>
        <name>RefName</name>
        <value>Header001</value>
    </Reference>

    <NodeNumber>1</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>100</value>
    </Reference>

    <NodeNumber>2</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>101</value>
    </Reference>

    <NodeNumber>3</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>101</value>
    </Reference>

    <NodeNumber>4</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>100</value>
    </Reference>

    <NodeNumber>5</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>102</value>
    </Reference>
</Root>

Expected Output:

<Root>
    <RootHeader>Header</RootHeader>
    <Reference>
        <name>RefName</name>
        <value>Header001</value>
    </Reference>

    <GroupingSequenceNumber>1</GroupingSequenceNumber>
    <NodeNumber>1</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>100</value>
    </Reference>

    <GroupingSequenceNumber>1</GroupingSequenceNumber>
    <NodeNumber>2</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>101</value>
    </Reference>

    <GroupingSequenceNumber>2</GroupingSequenceNumber>
    <NodeNumber>3</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>100</value>
    </Reference>

    <GroupingSequenceNumber>3</GroupingSequenceNumber>
    <NodeNumber>4</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>100</value>
    </Reference>

    <GroupingSequenceNumber>1</GroupingSequenceNumber>
    <NodeNumber>5</NodeNumber>
    <Reference>
        <name>RefName</name>
        <value>102</value>
    </Reference>
</Root>

How to do grouping based on Root/Reference/Value and add Grouping Sequence Number in output?

Reference in header should be excluded in grouping. Means Grouping should start after occurance of NodeNumber.

Thank you in Advance.

Answer 1

This is very similar to your previous question of Grouping of xml nodes in xslt 1.0

In this case though, you really want to match the NodeNumber elements, and count them by looking at the value following Reference elements.

<xsl:variable name="Ref" select="following-sibling::Reference[1]/value"/>
<GroupingSequenceNumber>
   <xsl:number count="NodeNumber[following-sibling::Reference[1]/value = $Ref]"/>
</GroupingSequenceNumber>

Here is the full XSLT

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
   <xsl:output method="xml" indent="yes"/>

   <xsl:template match="NodeNumber">
      <xsl:variable name="Ref" select="following-sibling::Reference[1]/value"/>
      <GroupingSequenceNumber>
         <xsl:number count="NodeNumber[following-sibling::Reference[1]/value = $Ref]"/>
      </GroupingSequenceNumber>
      <xsl:copy-of select="."/>
   </xsl:template>

   <xsl:template match="@*|node()">
      <xsl:copy>
         <xsl:apply-templates select="@*|node()"/>
      </xsl:copy>
   </xsl:template>
</xsl:stylesheet>

When applied to your sample input document, the following is output

<Root>
   <RootHeader>Header</RootHeader>
   <Reference>
      <name>RefName</name>
      <value>Header001</value>
   </Reference>
   <GroupingSequenceNumber>1</GroupingSequenceNumber>
   <NodeNumber>1</NodeNumber>
   <Reference>
      <name>RefName</name>
      <value>100</value>
   </Reference>
   <GroupingSequenceNumber>1</GroupingSequenceNumber>
   <NodeNumber>2</NodeNumber>
   <Reference>
      <name>RefName</name>
      <value>101</value>
   </Reference>
   <GroupingSequenceNumber>2</GroupingSequenceNumber>
   <NodeNumber>3</NodeNumber>
   <Reference>
      <name>RefName</name>
      <value>101</value>
   </Reference>
   <GroupingSequenceNumber>2</GroupingSequenceNumber>
   <NodeNumber>4</NodeNumber>
   <Reference>
      <name>RefName</name>
      <value>100</value>
   </Reference>
   <GroupingSequenceNumber>1</GroupingSequenceNumber>
   <NodeNumber>5</NodeNumber>
   <Reference>
      <name>RefName</name>
      <value>102</value>
   </Reference>
</Root>