Insert element and add prefix using xslt - xslt

Question

I need to add or insert another element and attribute <vat:IRmark Type="generic"/> after the <DefaultCurrency>. And, there is a certain group which is the <Group> element that I need to add a prefix. I almost did it, but the insertion of element didn't working. Here is my sample test file:
INPUT File:
<Data>
<Record>
<ID>123-AAA</ID>
<Date>2017-04-23</Date>
<Group>
<Hdr>
<ID>833-AAA</ID>
<DefaultCurrency>GBP</DefaultCurrency>
<Sender>truth</Sender>
</Hdr>
</Group>
</Record>
GENERATED OUTPUT:
<Data>
<Record xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:vat="http://www.govtalk.gov.uk/taxation/vat/vatdeclaration/2" schemaLocation="http://www.govtalk.gov.uk/CM/envelope http://www.govtalk.gov.uk/taxation/vat/vatdeclaration/2">
<ID>123-AAA</ID>
<Date>2017-04-23</Date>
<vat:Group>
<vat:Hdr>
<vat:ID>833-AAA</vat:ID>
<vat:DefaultCurrency>GBP</vat:DefaultCurrency>
<vat:Sender>truth</vat:Sender>
</vat:Hdr>
</vat:Group>
</Record>
EXPECTED OUTPUT:
<Data>
<Record xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:vat="http://www.govtalk.gov.uk/taxation/vat/vatdeclaration/2" schemaLocation="http://www.govtalk.gov.uk/CM/envelope http://www.govtalk.gov.uk/taxation/vat/vatdeclaration/2">
<ID>123-AAA</ID>
<Date>2017-04-23</Date>
<vat:Group>
<vat:Hdr>
<vat:ID>833-AAA</vat:ID>
<vat:DefaultCurrency>GBP</vat:DefaultCurrency>
<vat:IRmark Type="generic"/>
<vat:Sender>truth</vat:Sender>
</vat:Hdr>
</vat:Group>
</Record>
XSLT Code:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:vat="http://www.govtalk.gov.uk/taxation/vat/vatdeclaration/2">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()[boolean(normalize-space())]|#*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="DefaultCurrency">
<xsl:copy-of select="."/>
<vat:IRmark>
<xsl:attribute name="Type">generic</xsl:attribute>
</vat:IRmark>
</xsl:template>
<xsl:template match="*[ancestor-or-self::Group]">
<xsl:element name="vat:{local-name()}">
<xsl:copy-of select="#*"/>
<xsl:apply-templates/>
</xsl:element>
</xsl:template>
<xsl:template match="Record">
<Record xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:vat="http://www.govtalk.gov.uk/taxation/vat/vatdeclaration/2" schemaLocation="http://www.govtalk.gov.uk/CM/envelope http://www.govtalk.gov.uk/taxation/vat/vatdeclaration/2">
<xsl:apply-templates/>
</Record>
</xsl:template>
Thank you.

Answer 1

This is because of template priority. The template that matches *[ancestor-or-self::Group] will match also the element DefaultCurrency. Because of the condition in the template match, the template has a higher priority (0.5, I think, compared with a priority of 0 for the template matching DefaultCurrency) and so this template will be used.
To get around this, assign a manual priority to your template that matches DefaultCurrency
<xsl:template match="DefaultCurrency" priority="1">
You can read up on conflict resolution for templates at https://www.w3.org/TR/xslt#conflict