Question

I want to use XSLT to modify :

<Office Code="1" OtherAttribute="5">
   <Customer CustomerId="0010" CodeModifier="A"/>
   <Customer CustomerId="0011" CodeModifier="B"/>
   <Customer CustomerId="0012" CodeModifier="B"/>
</Office>
<Office Code="2" OtherAttribute="6">
   <Customer CustomerId="2010" CodeModifier="A"/>
   <Customer CustomerId="0011" CodeModifier="C"/>
</Office>

into :

<Office Code="1A" OtherAttribute="5">
   <Customer CustomerId="0010"/>
</Office>
<Office Code="1B" OtherAttribute="5">
   <Customer CustomerId="0011"/>
   <Customer CustomerId="0012"/>
</Office>
<Office Code="2A" OtherAttribute="6">
   <Customer CustomerId="2010"/>
</Office>
<Office Code="2C" OtherAttribute="6">
   <Customer CustomerId="0011"/>
</Office>

My goals :

• group every Customer entity with the same CodeModifier into Office entities. If there are some multiple CodeModifier, I will add Office entity. The Code attribute into Office will be modified (concatenation of CodeModifier of Client into the Office)
• (facultative but trivial I think) suppress the CodeModifier attribute and keep all other attribute

Does someone know how to do that ?

Answer 1

Here’s another approach, using matching templates only.

---

Tested as XSLT 1.0 under MSXSL 4.0

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

    <xsl:key name="kCustomerGroup" match="Customer" 
        use="concat(../@Code, @CodeModifier)" 
        />

    <xsl:template match="Office">
        <xsl:apply-templates select="Customer[generate-id() 
            =
            generate-id(key('kCustomerGroup', 
            concat(../@Code, @CodeModifier))[1])]"
            />
    </xsl:template>

    <xsl:template match="Customer">
        <Office 
            Code="{concat(../@Code,@CodeModifier)}" 
            OtherAttribute="{../@OtherAttribute}">

            <xsl:apply-templates select="key('kCustomerGroup', 
                concat(../@Code,@CodeModifier))" mode="copy"/>

        </Office>
    </xsl:template>

    <xsl:template match="Customer" mode="copy">
        <xsl:copy>
            <xsl:copy-of select="@CustomerId"/>
        </xsl:copy>
    </xsl:template>

</xsl:stylesheet>

Outputs to:

<?xml version="1.0" encoding="UTF-8"?>
<Office Code="1A" OtherAttribute="5">
   <Customer CustomerId="0010"/>
</Office>
<Office Code="1B" OtherAttribute="5">
   <Customer CustomerId="0011"/>
   <Customer CustomerId="0012"/>
</Office>
<Office Code="2A" OtherAttribute="6">
   <Customer CustomerId="2010"/>
</Office>
<Office Code="2C" OtherAttribute="6">
   <Customer CustomerId="0011"/>
</Office>