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<!--
XSLT for removing unused namespaces from an XML file.
Author: Dimitre Novatchev
Source: https://stackoverflow.com/a/4594626
License: CC BY-SA, https://creativecommons.org/licenses/by-sa/2.5/
Usage:
xmlstarlet tr remove-unused-namespaces.xslt -
Processes stdin and writes the result to stdout.
-->
<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()|@*" priority="-2">
<xsl:copy>
<xsl:apply-templates select="node()|@*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*">
<xsl:element name="{name()}" namespace="{namespace-uri()}">
<xsl:variable name="vtheElem" select="."/>
<xsl:for-each select="namespace::*">
<xsl:variable name="vPrefix" select="name()"/>
<xsl:if test=
"$vtheElem/descendant::*
[(namespace-uri()=current()
and
substring-before(name(),':') = $vPrefix)
or
@*[substring-before(name(),':') = $vPrefix]
]
">
<xsl:copy-of select="."/>
</xsl:if>
</xsl:for-each>
<xsl:apply-templates select="node()|@*"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
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