XSLT renaming element with attribute value? - xslt

Question

I have this XML:
<PARTY>
<PARTY_ID type="buyer_specific">XXXXXX</PARTY_ID>
<PARTY_ID type="gln">YYYYYYYYYYYY</PARTY_ID>
<PARTY_ROLE>buyer</PARTY_ROLE>
</PARTY>
And I need the elements PARTY_ID to be named different, preferably set to the same as type
So preferred result would be:
<PARTY>
<buyer_specific>XXXXXX</buyer_specific>
<gln>YYYYYYYYYYYY</gln>
<PARTY_ROLE>buyer</PARTY_ROLE>
</PARTY>
I know this is probably a easy fix, but I am really new at XSLT..... thx for your patience and help!

Answer 1

I have managed to get something that is ok for the task at hand working:
<?xml version="1.0"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="PARTY_ID[#type]">
<xsl:element name="{#type}">
<xsl:apply-templates/>
</xsl:element>
</xsl:template>
<xsl:template match="*">
<xsl:element name="{local-name()}" namespace="http://www.opentrans.org/XMLSchema/2.1">
<xsl:apply-templates/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
Not ideal, but it works...
Thank you for reading!

Answer 2

As simple as this:
<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:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="PARTY_ID[#type]">
<xsl:element name="{#type}"><xsl:apply-templates/></xsl:element>
</xsl:template>
</xsl:stylesheet>
When this transformation is applied on the provided XML document:
<PARTY>
<PARTY_ID type="buyer_specific">XXXXXX</PARTY_ID>
<PARTY_ID type="gln">YYYYYYYYYYYY</PARTY_ID>
<PARTY_ROLE>buyer</PARTY_ROLE>
</PARTY>
The wanted, correct result is produced:
<PARTY>
<buyer_specific>XXXXXX</buyer_specific>
<gln>YYYYYYYYYYYY</gln>
<PARTY_ROLE>buyer</PARTY_ROLE>
</PARTY>
Explanaion:
Using the identity rule to copy every node "as-is"
Overriding the identity rule with a more specific one matching any PARTY_ID element that has a type attribute
Using an <xsl:element> instruction with AVL (Attribute Value Template) for the name of the element -- to be constructed from the value of the type attribute of the current node.