Question

I’m trying to do an xml trasformation with XSLT. I have the following xml:

<myxml>
<dataType1>
    <value1>
        A1
    </value1>
    <value2>
        A2
    </value2>
</dataType1>
<dataType1>
    <value1>
        B1
    </value1>
    <value2>
        B2
    </value2>
</dataType1>
<dataType2>
    <value1>
        A1
    </value1>
    <value3>
        A3
    </value3>
</dataType2>
<dataType2>
    <value1>
        B1
    </value1>
    <value3>
        B3
    </value3>
</dataType2>

each datatype2 has an element value1 that is a foreign key in the datatype2 so then I have to map this data based on the value1.

If exists a dataType1 with value1=A1 and a dataType2 with a value1=A1 then I have to create an xml with the values of value2 and value3 so the result will be the following:

<resultxml>
<data>
    <value2>
        A2
    </value2>
    <value3>
        A3
    </value3>
</data>
<data>
    <value2>
        B2
    </value2>
    <value3>
        B3
    </value3>
</data>

I thought about creating dynamically the variables while reading the dataType1 and then calling them when reading the datatype2 but as I read on some forum that is not possible so my question is: is possible to do what I explained? if yes which is the approach I have to follow (examples are welcome)

thanks in advance

Answer 1

This 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="kType1" match="dataType1" use="normalize-space(value1)"/>

 <xsl:template match="dataType2[key('kType1', normalize-space(value1))]">
     <data>
       <value2>
         <xsl:value-of select="key('kType1', normalize-space(value1))/value2"/>
       </value2>
       <xsl:copy-of select="value3"/>
     </data>
 </xsl:template>
 <xsl:template match="text()"/>
</xsl:stylesheet>

when applied on the provided XML document:

<myxml>
    <dataType1>
        <value1>
        A1
        </value1>
        <value2>
        A2
        </value2>
    </dataType1>
    <dataType1>
        <value1>
        B1
        </value1>
        <value2>
        B2
        </value2>
    </dataType1>
    <dataType2>
        <value1>
        A1
        </value1>
        <value3>
        A3
        </value3>
    </dataType2>
    <dataType2>
        <value1>
        B1
        </value1>
        <value3>
        B3
        </value3>
    </dataType2>
</myxml>

produces the wanted, correct result:

<data>
   <value2>
        A2
   </value2>
   <value3>
        A3
   </value3>
</data>
<data>
   <value2>
        B2
   </value2>
   <value3>
        B3
   </value3>
</data>