Question

I have xml which contain some documents:

<document>
    <line id="0">
        <field id="0"><![CDATA[H:doc1]]></field>
    </line>
    <line id="1">
        <field id="0"><![CDATA[L:1]]></field>
    </line>
    <line id="2">
        <field id="0"><![CDATA[L:2]]></field>
    </line>
    <line id="3">
        <field id="0"><![CDATA[L:3]]></field>
    </line>
    <line id="4">
        <field id="0"><![CDATA[H:doc2]]></field>
    </line>
    <line id="5">
        <field id="0"><![CDATA[L:1]]></field>
    </line> 
</document>

H=header of document and L=Line-item. in this example whe have two H that means two documents which number doc1 and doc2. doc1 have three line items and doc2 have one line item.

how to convert data using xslt version 1 to get this result:

<documents>
    <document>
        <header>
            <number>doc1</number>
        </header>
        <line-item>
            <line-number>1</line-number>
            <line-number>2</line-number>
            <line-number>3</line-number>
        </line-item>
    </document>
    <document>
        <header>
            <number>doc2</number>
        </header>
        <line-item>
            <line-number>1</line-number>
        </line-item>
    </document>
</documents>

Answer 1

This XSLT 1.0 transformation:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <xsl:key name="kFollowing"
   match="line[starts-with(field,'L:')]"
   use="generate-id(preceding-sibling::line
                         [starts-with(field,'H:')]
                         [1]
                    )"/>

 <xsl:template match="/">
     <documents>
      <xsl:apply-templates/>
     </documents>
 </xsl:template>

 <xsl:template match="line[starts-with(field,'H:')]">
  <document>
   <header>
    <number><xsl:value-of select="substring-after(field,'H:')"/></number>
    <line-item>
     <xsl:apply-templates mode="inGroup" select=
        "key('kFollowing', generate-id())"/>
    </line-item>
   </header>
  </document>
 </xsl:template>

 <xsl:template match="line" mode="inGroup">
  <line-number>
   <xsl:value-of select="substring-after(field,'L:')"/>
  </line-number>
 </xsl:template>
 <xsl:template match="text()"/>
</xsl:stylesheet>

when applied on the provided XML document:

<document>
    <line id="0">
        <field id="0"><![CDATA[H:doc1]]></field>
    </line>
    <line id="1">
        <field id="0"><![CDATA[L:1]]></field>
    </line>
    <line id="2">
        <field id="0"><![CDATA[L:2]]></field>
    </line>
    <line id="3">
        <field id="0"><![CDATA[L:3]]></field>
    </line>
    <line id="4">
        <field id="0"><![CDATA[H:doc2]]></field>
    </line>
    <line id="5">
        <field id="0"><![CDATA[L:1]]></field>
    </line>
</document>

produces the wanted, correct result:

<documents>
   <document>
      <header>
         <number>doc1</number>
         <line-item>
            <line-number>1</line-number>
            <line-number>2</line-number>
            <line-number>3</line-number>
         </line-item>
      </header>
   </document>
   <document>
      <header>
         <number>doc2</number>
         <line-item>
            <line-number>1</line-number>
         </line-item>
      </header>
   </document>
</documents>

Explanation: Using keys to conveniently specify and select the complete group of adjacent “lines” following a “header”.