XSLT 1.0 For-Each-Group flat XML

Question

I need some help here. I'm kinda new to XSLT.

I know in 2.0 you can use For-Each-Group which would solve my problem, but I'm limited to 1.0.

What I need to to group a flat XML using something like "group-starting-with" function.

This is only an example, but my real problem is very similar.

I have this XML:

<?xml version="1.0" encoding="UTF-8"?>
    <catalog>

        <xpto name="1">ABC</xpto>
        <title>Empire Burlesque</title>
        <artist>Bob Dylan</artist>
        <country>USA</country>
        <company>Columbia</company>
        <price>10.90</price>
        <year>1985</year>
        <xpto name="2">ABC</xpto>

        <xpto name="1">ABC</xpto>
        <title>Hide your heart</title>
        <artist>Bob Dylan</artist>
        <country>UK</country>
        <company>CBS Records</company>
        <price>9.90</price>
        <year>1988</year>
        <xpto name="2">ABC</xpto>

    </catalog>

And I want it to be:

<?xml version="1.0" encoding="UTF-8"?>
    <catalog>

        <group>
            <xpto name="1">ABC</xpto>
            <title>Empire Burlesque</title>
            <artist>Bob Dylan</artist>
            <country>USA</country>
            <company>Columbia</company>
            <price>10.90</price>
            <year>1985</year>
            <xpto name="2">ABC</xpto>
        </group>

        <group>
            <xpto name="1">ABC</xpto>
            <title>Hide your heart</title>
            <artist>Bob Dylan</artist>
            <country>UK</country>
            <company>CBS Records</company>
            <price>9.90</price>
            <year>1988</year>
            <xpto name="2">ABC</xpto>
        </group>

    </catalog>

So I want to group the elements every time the following appears:

    <xpto name="1">ABC</xpto>

Is there any way to do this with XSLT 1.0?

Thank you very much!

Answer 1

Assuming you want to group the elements starting with <xpto name="1"> elements, you could define a key to group the other child elements by the first such element that precedes them:

 <xsl:key name="start" match="*[not(self::xpto[@name='1'])]" use="generate-id(preceding-sibling::xpto[@name='1'][1])" />

Then, you can select all your starting elements, and get the other group items like so:

<xsl:apply-templates select=".|key('start', generate-id())" /> 

Try this XSLT

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">

  <xsl:key name="start" match="*[not(self::xpto[@name='1'])]" use="generate-id(preceding-sibling::xpto[@name='1'][1])" />

  <xsl:output method="xml" indent="yes" />

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

  <xsl:template match="catalog">
    <xsl:copy>
      <xsl:for-each select="xpto[@name='1']">
        <group>
          <xsl:apply-templates select=".|key('start', generate-id())" /> 
        </group>
      </xsl:for-each>
    </xsl:copy>
  </xsl:template>

</xsl:stylesheet>