<?xml version="1.0" encoding="UTF-8"?>
<MapExampleFlatStructureMessage version="1.1">
<Person>
<Id>123456</Id>
<Name>John Doe</Name>
<TelephoneNumber>555-1234</TelephoneNumber>
</Person>
<Person>
<Id>789012</Id>
<Name>Jane Smith</Name>
<TelephoneNumber>555-5678</TelephoneNumber>
</Person>
<Person>
<Id>123456</Id>
<Name>John Doe</Name>
<TelephoneNumber>555-12341</TelephoneNumber>
</Person>
<Person>
<Id>789012</Id>
<Name>Jane Smith</Name>
<TelephoneNumber>555-56781</TelephoneNumber>
</Person>
<Person>
<Id>789012</Id>
<Name>Jane Smith</Name>
<TelephoneNumber>555-56782</TelephoneNumber>
</Person>
</MapExampleFlatStructureMessage>
--------------
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xs">
<xsl:output indent="yes"/>
<xsl:key name="person-by-id" match="Person" use="Id"/>
<xsl:template match="/">
<xsl:element name="MapExampleFlatStructureMessage">
<xsl:attribute name="version">1.1</xsl:attribute>
<xsl:for-each select="MapExampleFlatStructureMessage/Person[count(. | key('person-by-id', Id)[1]) = 1]">
<xsl:variable name="personId" select="Id"/>
<xsl:element name="Person">
<xsl:element name="Id">
<xsl:value-of select="$personId"/>
</xsl:element>
<xsl:element name="Name">
<xsl:value-of select="Name"/>
</xsl:element>
<xsl:element name="Telephones">
<xsl:for-each select="key('person-by-id', $personId)">
<xsl:element name="TelephoneNumber">
<xsl:value-of select="TelephoneNumber"/>
</xsl:element>
</xsl:for-each>
</xsl:element>
</xsl:element>
</xsl:for-each>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
-------------
<?xml version="1.0" encoding="UTF-8"?>
<MapExampleFlatStructureMessage version="1.1">
<Person>
<Id>123456</Id>
<Name>John Doe</Name>
<Telephones>
<TelephoneNumber>555-1234</TelephoneNumber>
<TelephoneNumber>555-12341</TelephoneNumber>
</Telephones>
</Person>
<Person>
<Id>789012</Id>
<Name>Jane Smith</Name>
<Telephones>
<TelephoneNumber>555-5678</TelephoneNumber>
<TelephoneNumber>555-56781</TelephoneNumber>
<TelephoneNumber>555-56782</TelephoneNumber>
</Telephones>
</Person>
</MapExampleFlatStructureMessage>
---------------------------
Here is an XSLT to group TelephoneNumbers based on Person/Id:
xslt
Copy code
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xs">
<xsl:key name="person-by-id" match="Person" use="Id"/>
<xsl:template match="/">
<xsl:element name="MapExampleFlatStructureMessage">
<xsl:attribute name="version">1.1</xsl:attribute>
<xsl:for-each select="MapExampleFlatStructureMessage/Person[count(. | key('person-by-id', Id)[1]) = 1]">
<xsl:variable name="personId" select="Id"/>
<xsl:element name="Person">
<xsl:element name="Id">
<xsl:value-of select="$personId"/>
</xsl:element>
<xsl:element name="Name">
<xsl:value-of select="Name"/>
</xsl:element>
<xsl:element name="Telephones">
<xsl:for-each select="key('person-by-id', $personId)">
<xsl:element name="TelephoneNumber">
<xsl:value-of select="TelephoneNumber"/>
</xsl:element>
</xsl:for-each>
</xsl:element>
</xsl:element>
</xsl:for-each>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
This XSLT uses the key function to group Person elements by their Id values. The xsl:key element defines a key named "person-by-id" that matches Person elements and uses their Id value as the key.
The xsl:for-each loop selects distinct Person elements based on their Id value using the count(. | key('person-by-id', Id)[1]) = 1 expression.
Inside the loop, the Id and Name elements are copied to the output, and a new Telephones element is created. The key function is used again to select all Person elements with the same Id value, and their TelephoneNumber elements are copied inside the Telephones element.
Running this XSLT with the sample input XML file should produce the following output:
xml
Copy code
<MapExampleFlatStructureMessage version="1.1">
<Person>
<Id>123456</Id>
<Name>John Doe</Name>
<Telephones>
<TelephoneNumber>555-1234</TelephoneNumber>
<TelephoneNumber>555-12341</TelephoneNumber>
</Telephones>
</Person>
<Person>
<Id>789012</Id>
<Name>Jane Smith</Name>
<Telephones>
<TelephoneNumber>555-5678</TelephoneNumber>
<TelephoneNumber>555-56781</TelephoneNumber>
<TelephoneNumber>555-56782</TelephoneNumber>
</Telephones>
</Person>
</MapExampleFlatStructureMessage>
User
Can you write above code in another way?
ChatGPT
Certainly! Here's an alternative way to write the XSLT code to group TelephoneNumbers based on Person/Id:
php
Copy code
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ms="urn:schemas-microsoft-com:xslt" exclude-result-prefixes="ms">
<xsl:key name="person-by-id" match="Person" use="Id" />
<xsl:template match="/">
<MapExampleFlatStructureMessage>
<xsl:for-each select="//Person[count(. | key('person-by-id', Id)[1]) = 1]">
<Person>
<Id><xsl:value-of select="Id"/></Id>
<Name><xsl:value-of select="Name"/></Name>
<Telephones>
<xsl:for-each select="key('person-by-id', Id)">
<TelephoneNumber><xsl:value-of select="TelephoneNumber"/></TelephoneNumber>
</xsl:for-each>
</Telephones>
</Person>
</xsl:for-each>
</MapExampleFlatStructureMessage>
</xsl:template>
</xsl:stylesheet>
This code defines a key named "person-by-id" that matches the "Person" elements based on their "Id" child element. Then, it loops through each unique "Person/Id" combination (using a technique called Muenchian grouping), and for each one, it creates a "Person" element with the "Id" and "Name" child elements, and a "Telephones" element that contains all the "TelephoneNumber" elements for that "Person/Id" combination.
User
good, any other alternative code yet
ChatGPT
Sure, here's another alternative XSLT code that uses the xsl:for-each-group element to group the Person elements by their Id child element:
php
Copy code
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<MapExampleFlatStructureMessage>
<xsl:for-each-group select="//Person" group-by="Id">
<Person>
<Id><xsl:value-of select="Id"/></Id>
<Name><xsl:value-of select="Name"/></Name>
<Telephones>
<xsl:for-each select="current-group()">
<TelephoneNumber><xsl:value-of select="TelephoneNumber"/></TelephoneNumber>
</xsl:for-each>
</Telephones>
</Person>
</xsl:for-each-group>
</MapExampleFlatStructureMessage>
</xsl:template>
</xsl:stylesheet>
This code uses the xsl:for-each-group element to loop through all the Person elements and group them based on their Id child element. For each group, it creates a Person element with the Id and Name child elements, and a Telephones element that contains all the TelephoneNumber elements for that group. The current-group() function is used to access the elements in the current group.
User
good, among 3 which is optimal in above case?
ChatGPT
2 / 2
All three XSLT codes achieve the same result and are correct.
In terms of optimization, the first XSLT code is the most concise, but it may not be the most readable or maintainable, especially if the transformation logic becomes more complex. The second and third XSLT codes use the xsl:for-each-group element to group the Person elements, which can make the code more readable and easier to maintain, especially as the transformation logic becomes more complex.
Therefore, the second and third XSLT codes may be more optimal in terms of readability and maintainability, while the first XSLT code may be more optimal in terms of code length.
