XML to XML - Create Unique IDs and reference them in the same document

Question

I have a source xml that contains the addresses in spot and need to transform into an xml that holds all addresses into a single element and references each one. I am using Saxon 9.1 processor and stylesheet version 1.0. Thank you for helping.

Source Code:

<?xml version="1.0" encoding="utf-8"?>
<ContactDetails xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <AddressDetails StartDate="1992-04-03" Type="Previous">
        <Address>
            <City City="Wien" />
            <Postcode Postcode="LSP-123" />
        </Address>
    </AddressDetails>
    <AddressDetails StartDate="1982-09-19" Type="Current">
        <Address>
            <City City="Toronto" />
            <Postcode Postcode="LKT-947" />
        </Address>
    </AddressDetails>
    <AddressDetails StartDate="1977-05-27" Type="Mailing">
        <Address>
            <City City="Sydney" />
            <Postcode Postcode="OKU-846" />
        </Address>
    </AddressDetails>
</ContactDetails>

Target Code:

<?xml version="1.0" encoding="utf-8"?>
<Application xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <ContactDetails>
        <AddressDetails StartDate="1992-04-03" Type="Previous">
            <AddressRef ReferedID="Prev_1" />
        </AddressDetails>
        <AddressDetails StartDate="1982-09-19" Type="Current">
            <AddressRef ReferedID="Curr_2" />
        </AddressDetails>
        <AddressDetails StartDate="1977-05-27" Type="Mailing">
            <AddressRef ReferedID="Mail_3" />
        </AddressDetails>
    </ContactDetails>
    <AddressSegment>
            <Address>
                <ID ID="Prev_1" />
                <City City="Wien" />
                <Postcode Postcode="LSP-123" />
            </Address>
            <Address>
                <ID UniqueID="Curr_2" />
                <City City="Toronto" />
                <Postcode Postcode="LKT-947" />
            </Address>        
            <Address>
                <ID UniqueID="Mail_3" />
                <City City="Sydney" />
                <Postcode Postcode="OKU-846" />
            </Address>        
    </AddressSegment>
</Application>

Have played with key and generate-id as I was trying to Generate the ID's first and copy them in the address. Here is my last trial of the xslt (best result I got was to have the UniqueID's empty so I have no idea how far off this solution is :) )

<?xml version='1.0' ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:key name="ID_key" match="*[@ReferedID]" use="@ReferedID"/>
<xsl:template match="/">
    <Application>
    <ContactDetails>
        <xsl:for-each select="Application/Person/ContactDetails/AddressDetails">
        <AddressDetails>
            <xsl:attribute name="StartDate">
            <xsl:value-of select="@StartDate"/>
            </xsl:attribute>
                        <xsl:attribute name="Type">
                            <xsl:value-of select="@Type" />
            </xsl:attribute>
                <AddressRef>
            <xsl:attribute name="ReferedID">
                <xsl:value-of select="generate-id()"/>
            </xsl:attribute>
            </AddressRef>
        </AddressDetails>
        </xsl:for-each>
    </ContactDetails>
    <AddressSegment>
        <xsl:for-each select="Application/Person/ContactDetails/AddressDetails">
        <Address>
            <ID>
            <xsl:attribute name="UniqueID">
                <xsl:value-of select="Address/ID[generate-id()=generate-id(key('ID_key',@UniqueID))]" />
            </xsl:attribute>
            </ID>
            <City>
            <xsl:attribute name="City">
                <xsl:value-of select="Address/City/@City"/>
            </xsl:attribute>
            </City>
                        <Postcode>
                                    <sl:attribute name="Postcode">
                    <xsl:value-of select="Address/Postcode/@Postcode"/>
                    </xsl:attribute>
            </Postcode>
        </Address>
            </xsl:for-each>
     </AddressSegment>
   </Application>
   </xsl:template>
</xsl:stylesheet>

Answer 1

To give you an example of how you could use generate-id and modes, the sample stylesheet

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

  <xsl:strip-space elements="*"/>
  <xsl:output indent="yes"/>

  <xsl:template match="ContactDetails">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <ContactDetails>
        <xsl:apply-templates select="AddressDetails/Address" mode="det"/>
      </ContactDetails>
      <AddressSegment>
        <xsl:apply-templates select="AddressDetails/Address"/>
      </AddressSegment>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="Address" mode="det">
    <AddressDetails StartDate="{../@StartDate}" Type="{../@Type}">
      <AddressRef ReferedID="{generate-id()}"/>
    </AddressDetails>
  </xsl:template>

  <xsl:template match="Address">
    <xsl:copy>
      <xsl:copy-of select="@*"/>
      <ID ID="{generate-id()}"/>
      <xsl:copy-of select="*"/>
    </xsl:copy>
  </xsl:template>

</xsl:stylesheet>

transforms the input

<?xml version="1.0" encoding="utf-8"?>
<ContactDetails xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <AddressDetails StartDate="1992-04-03" Type="Previous">
        <Address>
            <City City="Wien" />
            <Postcode Postcode="LSP-123" />
        </Address>
    </AddressDetails>
    <AddressDetails StartDate="1982-09-19" Type="Current">
        <Address>
            <City City="Toronto" />
            <Postcode Postcode="LKT-947" />
        </Address>
    </AddressDetails>
    <AddressDetails StartDate="1977-05-27" Type="Mailing">
        <Address>
            <City City="Sydney" />
            <Postcode Postcode="OKU-846" />
        </Address>
    </AddressDetails>
</ContactDetails>

with Saxon 6.5.5 into the output

<ContactDetails xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <ContactDetails>
      <AddressDetails StartDate="1992-04-03" Type="Previous">
         <AddressRef ReferedID="d0e3"/>
      </AddressDetails>
      <AddressDetails StartDate="1982-09-19" Type="Current">
         <AddressRef ReferedID="d0e7"/>
      </AddressDetails>
      <AddressDetails StartDate="1977-05-27" Type="Mailing">
         <AddressRef ReferedID="d0e11"/>
      </AddressDetails>
   </ContactDetails>
   <AddressSegment>
      <Address>
         <ID ID="d0e3"/>
         <City City="Wien"/>
         <Postcode Postcode="LSP-123"/>
      </Address>
      <Address>
         <ID ID="d0e7"/>
         <City City="Toronto"/>
         <Postcode Postcode="LKT-947"/>
      </Address>
      <Address>
         <ID ID="d0e11"/>
         <City City="Sydney"/>
         <Postcode Postcode="OKU-846"/>
      </Address>
   </AddressSegment>
</ContactDetails>