2 tables to single table structure based on correlation example xslt ; chatGPT help; UDF alternative in xslt; deep structure

 

<MapExampleFlatStructureMessage version="1.1">

  <Persons>

    <Person>

      <Id>1</Id>

      <Name>John Doe</Name>

    </Person>

    <Person>

      <Id>2</Id>

      <Name>Jane Smith</Name>

    </Person>

  </Persons>

  <Telephones>

    <Telephone>

      <PersonId>1</PersonId>

      <TelephoneNumber>555-1234</TelephoneNumber>

    </Telephone>

    <Telephone>

      <PersonId>2</PersonId>

      <TelephoneNumber>555-5678</TelephoneNumber>

    </Telephone>

     <Telephone>

      <PersonId>2</PersonId>

      <TelephoneNumber>555-567821</TelephoneNumber>

    </Telephone>

    <Telephone>

      <PersonId>1</PersonId>

      <TelephoneNumber>555-12341</TelephoneNumber>

    </Telephone>

    <Telephone>

      <PersonId>2</PersonId>

      <TelephoneNumber>555-56781</TelephoneNumber>

    </Telephone>

    <Telephone>

      <PersonId>2</PersonId>

      <TelephoneNumber>555-56782</TelephoneNumber>

    </Telephone>

  </Telephones>

</MapExampleFlatStructureMessage>

---------------

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

   <xsl:output indent="yes"/>

  

   <xsl:key name="person-by-id" match="Person" use="Id"/>

   

   <xsl:template match="/">

      <xsl:apply-templates select="//Person"/>

   </xsl:template>

   

   <xsl:template match="Person">

      <xsl:variable name="person-id" select="Id"/>

      <Person>

         <xsl:copy-of select="Id"/>

         <xsl:copy-of select="Name"/>

         <xsl:for-each select="//Telephone[PersonId = $person-id]">

            <TelephoneNumber>

               <xsl:value-of select="TelephoneNumber"/>

            </TelephoneNumber>

         </xsl:for-each>

      </Person>

   </xsl:template>

  

</xsl:stylesheet>

-------------------

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

<Person>

   <Id>1</Id>

   <Name>John Doe</Name>

   <TelephoneNumber>555-1234</TelephoneNumber>

   <TelephoneNumber>555-12341</TelephoneNumber>

</Person>

<Person>

   <Id>2</Id>

   <Name>Jane Smith</Name>

   <TelephoneNumber>555-5678</TelephoneNumber>

   <TelephoneNumber>555-567821</TelephoneNumber>

   <TelephoneNumber>555-56781</TelephoneNumber>

   <TelephoneNumber>555-56782</TelephoneNumber>

</Person>

-----------------------

chat GPT discussion

write xslt code; by taking above xml as input and generate output file as below format, condition //id //PersonId of source are correlated; <Person>

      <Id>1</Id>

      <Name>John Doe</Name>

  <TelephoneNumber>555-1234</TelephoneNumber>

  <TelephoneNumber>555-12341</TelephoneNumber>

    </Person>

    <Person>

      <Id>2</Id>

      <Name>Jane Smith</Name>

   <TelephoneNumber>555-5678</TelephoneNumber>

    <TelephoneNumber>555-56781</TelephoneNumber>

<TelephoneNumber>555-56782</TelephoneNumber>

    </Person>

ChatGPT

Here is the XSLT code that will transform the input XML file to the desired output format:

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

   <xsl:output indent="yes"/>

  

   <xsl:key name="person-by-id" match="Person" use="Id"/>

   

   <xsl:template match="/">

      <xsl:apply-templates select="//Person"/>

   </xsl:template>

   

   <xsl:template match="Person">

      <xsl:variable name="person-id" select="Id"/>

      <Person>

         <xsl:copy-of select="Id"/>

         <xsl:copy-of select="Name"/>

         <xsl:for-each select="//Telephone[PersonId = $person-id]">

            <TelephoneNumber>

               <xsl:value-of select="TelephoneNumber"/>

            </TelephoneNumber>

         </xsl:for-each>

      </Person>

   </xsl:template>

  

</xsl:stylesheet>

Explanation:

The key element defines a key named "person-by-id" that matches the Person element based on its Id attribute.

The template element with the match="/" attribute is the root template that applies templates to the entire input XML.

The apply-templates element with the select="//Person" attribute applies templates to all Person elements in the input XML.

The template element with the match="Person" attribute defines a template that matches each Person element in the input XML.

The variable element with the name="person-id" attribute defines a variable that stores the Id attribute value of the current Person element.

The copy-of element with the select="Id" attribute copies the Id element of the current Person element to the output XML.

The copy-of element with the select="Name" attribute copies the Name element of the current Person element to the output XML.

The for-each element with the select="//Telephone[PersonId = $person-id]" attribute selects all Telephone elements in the input XML that have a PersonId attribute equal to the person-id variable value.

The TelephoneNumber element with the value-of element that selects the value of the TelephoneNumber element in the current Telephone element and adds it to the output XML.

----------------------------

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

   <xsl:output indent="yes"/>

  

   <xsl:key name="person-by-id" match="Person" use="Id"/>

   

   <xsl:template match="/">

      <xsl:apply-templates select="//Person"/>

   </xsl:template>

   

   <xsl:template match="Person">

      <xsl:variable name="person-id" select="Id"/>

      <Person>

         <xsl:copy-of select="Id"/>

         <xsl:copy-of select="Name"/>

         <xsl:for-each select="//Telephone[PersonId = $person-id]">

            <TelephoneNumber>

               <xsl:value-of select="TelephoneNumber"/>

            </TelephoneNumber>

         </xsl:for-each>

      </Person>

   </xsl:template>

  

</xsl:stylesheet>-->

<!--

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

<Person>

   <Id>1</Id>

   <Name>John Doe</Name>

   <TelephoneNumber>555-1234</TelephoneNumber>

   <TelephoneNumber>555-12341</TelephoneNumber>

</Person>

<Person>

   <Id>2</Id>

   <Name>Jane Smith</Name>

   <TelephoneNumber>555-5678</TelephoneNumber>

   <TelephoneNumber>555-567821</TelephoneNumber>

   <TelephoneNumber>555-56781</TelephoneNumber>

   <TelephoneNumber>555-56782</TelephoneNumber>

</Person>-->

<!--

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

  <xsl:output indent="yes"/>

  

  <xsl:key name="person-telephones" match="Telephone" use="PersonId"/>

  

  <xsl:template match="/">

    <xsl:apply-templates select="//Person"/>

  </xsl:template>

  

  <xsl:template match="Person">

    <Person>

      <xsl:copy-of select="Id"/>

      <xsl:copy-of select="Name"/>

      <xsl:apply-templates select="key('person-telephones', Id)"/>

    </Person>

  </xsl:template>

  

  <xsl:template match="Telephone">

    <TelephoneNumber><xsl:value-of select="."/></TelephoneNumber>

  </xsl:template>

  

</xsl:stylesheet>-->

<!-- again corrected-->

<!--

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

   <xsl:output indent="yes"/>

   <xsl:key name="person-telephones" match="//Telephone" use="PersonId"/>

   <xsl:template match="/">

      <xsl:element name="Root">

         <xsl:for-each select="//Person">

            <xsl:element name="Person">

               <xsl:element name="Id">

                  <xsl:value-of select="Id"/>

               </xsl:element>

               <xsl:element name="Name">

                  <xsl:value-of select="Name"/>

               </xsl:element>

               <xsl:for-each select="key('person-telephones', Id)">

                  <xsl:element name="TelephoneNumber">

                     <xsl:value-of select="TelephoneNumber"/>

                  </xsl:element>

               </xsl:for-each>

            </xsl:element>

         </xsl:for-each>

      </xsl:element>

   </xsl:template>

</xsl:stylesheet>-->

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

  <xsl:output indent="yes"/>

  

  <xsl:key name="person-key" match="//Person" use="Id" />

  

  <xsl:template match="/">

    <xsl:element name="Persons">

      <xsl:for-each select="//Person[generate-id() = generate-id(key('person-key', Id))]">

        <xsl:variable name="personId" select="Id"/>

        <xsl:element name="Person">

          <xsl:copy-of select="Id"/>

          <xsl:copy-of select="Name"/>

          <xsl:for-each select="//Telephone[PersonId = $personId]">

            <xsl:element name="TelephoneNumber">

              <xsl:value-of select="TelephoneNumber"/>

            </xsl:element>

          </xsl:for-each>

        </xsl:element>

      </xsl:for-each>

    </xsl:element>

  </xsl:template>

  

</xsl:stylesheet>

<!--

All of the codes provided are valid solutions and their efficiency depends on various factors such as the size of the input XML, the complexity of the transformation, and the XSLT processor being used. In terms of ease of writing, it may vary based on personal preferences and familiarity with the XSLT syntax.

However, the first code snippet that uses the "apply-templates" approach is generally considered a good practice and is more maintainable and scalable than the other solutions. The reason being is that it separates the concerns of transforming different elements and attributes into separate templates, which can be easily modified or reused in other transformations. Additionally, it reduces the amount of code duplication and promotes a more modular and readable code structure.

-->