Different behaviour of XSLT serialTransformation on wM 9.5 and wm 9.12

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Hi,

we are receiving a xml message from IBM MQSeries via WmMQAdapter (6.5) ListenerNotification without namespace prefix.
As we need these namespace prefixes for further processing of the data we are adding them with a very simple xslt transformation.

I have tested this on both my enviroments now and on 9.5 it is working as expected and on 9.12 it is failing with some “invalid xml message”:
[XSL.0002.9002] JAXP: Error during transformation - The processing instruction target matching "[xX][mM][lL]" is not allowed.; Line#: 1; Column#: 7

Both instances are using the same xslt defintion file as follows:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0" xmlns:tns="http://xxx" xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
	<xsl:template match="*">
		<xsl:element name="tns:{local-name()}">
			<xsl:copy-of select="@*"/>
			<xsl:apply-templates/>
		</xsl:element>
	</xsl:template>
	<xsl:template match="soap-env:*">
		<xsl:element name="soap-env:{local-name()}">
			<xsl:copy-of select="@*"/>
			<xsl:apply-templates/>
		</xsl:element>
	</xsl:template>
</xsl:stylesheet>

This transformation file is used with Built-In-Service pub.xslt.Transformations:transformSerialXML.
So tags without namespace prefix will be prefixed with “tns:” and those with “soap-env:” will/should retain this “soap-env:” prefix.

Were there any changes in WmXSLT package between 9.5 and 9.12 which might affect this behaviour?
wM 9.12 has quite recent fixes applied, wM 9.5 is a bit behing regarding fixes.

Any ideas or suggestions are welcome.

Regards,
Holger