Remove all elements with a specific namespace in xslt - xslt

Question

I have an xml which I'd like to change the namespace of most elements, remove some specific element names and also remove elements which contains a specific namespace. Example of such an xml
<root xmlns="somenamespace">
<elem1>sometext</eleme1>
<ns0:elem2 xmlns:ns0="othernamespace">
<ns1:elem3 xmlns:ns1="thirdnamespace" />
</ns0:elem2>
<elem4>sometext</elem4>
</root>
I am trying to use the following xslt:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="*[namespace-uri() = 'somenamespace']">
<xsl:choose>
<!-- change element name from root to root2 -->
<xsl:when test="local-name(.)='root'">
<xsl:element name="root2" namespace="mynamespace">
<xsl:apply-templates select="#* | node()" />
</xsl:element>
</xsl:when>
<!-- skip these elements that are not in root2 -->
<xsl:when test="local-name(.)='elem1'" />
<xsl:when test="namespace-uri()='othernamespace'" />
<!-- Copy other elemnts -->
<xsl:otherwise>
<xsl:element name="{name()}" namespace="mynamespace">
<xsl:apply-templates select="#* | node()" />
</xsl:element>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<!-- Copy the rest -->
<xsl:template match="#* | node()">
<xsl:copy>
<xsl:apply-templates select="#* | node()" />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
The output xml should be
<root2 xmlns="mynamespace">
<elem4>sometext</elem4>
</root2>
However the result is
<root2 xmlns="mynamespace" xmlns:ns0="othernamespace">
<ns0:elem2>
<ns1:elem3 xmlns:ns1="thirdnamespace" />
</ns0:elem2>
<elem4>sometext</elem4>
</root2>
It seems that most elements of the xslt are working except the one that is supposed to remove all elements of a specific namespace. Is there anything wrong in the xslt above?

Answer 1

Your first template is only matching elements in the somenamespace namespace. The other namespaces (othernamespace,thirdnamespace) are matched by the identity transform (last template) and are output as-is.
To strip all elements that aren't in the somenamespace namespace, add this template:
<xsl:template match="*[not(namespace-uri()='somenamespace')]" priority="1"/>