XSLT 1.0 - Change/add namespace to nodes - xslt

Question

I am currently trying to create an XSLT 1.0 mapping in SAP PI to change/add namespace of specific nodes. Given the Input.xml I have to create a XSL-file to get the Output.xml as you can see below. Unfortunately all my attempts were not successful so far. I would be happy if anybody can provide an XSL sheet to solve this issue. I would be glad if someone could help me, as I am already very close to despair.
Input.XML
<?xml version="1.0" encoding="UTF-8"?>
<ns0:serviceABC xmlns:ns0="http://namespaceToReplace">
<XYZ>
<Zugang>
<MandantCode>test</MandantCode>
<BenutzerId>test</BenutzerId>
<Password>test</Password>
</Zugang>
<Personen>
<GpCode>0000000001</GpCode>
<Name>Name1</Name>
<LandCode>DE</LandCode>
</Personen>
<Personen>
<GpCode>0000000002</GpCode>
<Name>Name2</Name>
<LandCode>DE</LandCode>
</Personen>
<Personen>
<GpCode>0000000003</GpCode>
<Name>Name3</Name>
<LandCode>DE</LandCode>
</Personen>
<Personen>
<GpCode>0000000004</GpCode>
<Name>Name4</Name>
<LandCode>DE</LandCode>
</Personen>
</XYZ>
</ns0:serviceABC>
Output.XML ("ns0:" - prefix needs to be removed, "xmlns="http://newNamespace1"" has to be replaced in node serviceABC, "xmlns="http://newNamespace2"" has to be added to node XYZ):
<?xml version="1.0" encoding="UTF-8"?>
<serviceABC xmlns="http://newNamespace1">
<XYZ xmlns="http://newNamespace2">
<Zugang>
<MandantCode>test</MandantCode>
<BenutzerId>test</BenutzerId>
<Password>test</Password>
</Zugang>
<Personen>
<GpCode>0000000001</GpCode>
<Name>Name1</Name>
<LandCode>DE</LandCode>
</Personen>
<Personen>
<GpCode>0000000002</GpCode>
<Name>Name2</Name>
<LandCode>DE</LandCode>
</Personen>
<Personen>
<GpCode>0000000003</GpCode>
<Name>Name3</Name>
<LandCode>DE</LandCode>
</Personen>
<Personen>
<GpCode>0000000004</GpCode>
<Name>Name4</Name>
<LandCode>DE</LandCode>
</Personen>
</XYZ>
</serviceABC>
I am looking forward hearing from you guys.
Source code developed that did not work at all

Answer 1

"xmlns="http://newNamespace2"" has to be added to node XYZ):
I don't think you understand the nature of your task. This is not a matter of adding a namespace declaration to a single node.
In your output, the XYZ element and all its descendants have been moved into the new namespace. That means they all have to be renamed (as does the root ns0:serviceABC element):
XSLT 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ns0="http://namespaceToReplace"
exclude-result-prefixes="ns0">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:template match="/ns0:serviceABC">
<serviceABC xmlns="http://newNamespace1">
<xsl:apply-templates/>
</serviceABC>
</xsl:template>
<xsl:template match="*">
<xsl:element name="{local-name()}" namespace="http://newNamespace2">
<xsl:apply-templates/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>