How to remove most namespaces from input XML in XSLT (nokogiri example) - ruby

Question

I have this piece of nokogiri code, thats runs slower then I like on large input. How would you redo this in XSLT? Any other ideas to make it run faster?
# remove namespaces (other then soapenv) from input xml, and move
# them to type attribute.
# xml is Nokogiri::XML object
def cleanup_namespaces(xml)
protected_ns = %w( soapenv )
xml.traverse do |el|
next unless el.respond_to? :namespace
if (ns=el.namespace) &&
!protected_ns.include?(ns.prefix) then
el['type'] = "#{ns.prefix}:#{el.name}"
el.namespace = nil
end
end
xml
end
The sample input I am testing with is:
<?xml version="1.0"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<ns1:getAccountDTOResponse xmlns:ns1="http://www.example.com/pw/services/PWServices"
soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<getAccountDTOReturn xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:ns2="urn:PWServices"
soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
xsi:type="ns2:Account">
<ns1:ID soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
xsi:type="xsd:long">0</ns1:ID>
<ns1:accountNumber xsi:type="soapenc:string" />
<ns1:accountType xsi:type="soapenc:string" />
<ns1:clientData xsi:type="soapenc:Array" xsi:nil="true" />
<ns1:name xsi:type="soapenc:string" />
<ns1:parentRef xsi:type="soapenc:string" />
</getAccountDTOReturn>
</ns1:getAccountDTOResponse>
</soapenv:Body>
</soapenv:Envelope>
The expected output is:
<?xml version="1.0"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<getAccountDTOResponse xmlns:ns1="http://www.example.com/pw/services/PWServices"
soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
type="ns1:getAccountDTOResponse">
<getAccountDTOReturn xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:ns2="urn:PWServices"
soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
xsi:type="ns2:Account">
<ID soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
xsi:type="xsd:long" type="ns1:ID">0</ID>
<accountNumber xsi:type="soapenc:string"
type="ns1:accountNumber" />
<accountType xsi:type="soapenc:string"
type="ns1:accountType" />
<clientData xsi:type="soapenc:Array" xsi:nil="true"
type="ns1:clientData" />
<name xsi:type="soapenc:string" type="ns1:name" />
<parentRef xsi:type="soapenc:string"
type="ns1:parentRef" />
</getAccountDTOReturn>
</getAccountDTOResponse>
</soapenv:Body>
</soapenv:Envelope>
This input is a SOAP response. A tangential question is, what is the
point of the ns1 type namespace in the SOAP response, and is it
reasonable to throw them away completely. I don't seem to need to
reference them when parsing the response.

Answer 1

This XSLT:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="#* | node()" name="identity">
<xsl:copy>
<xsl:apply-templates select="#* | node()" />
</xsl:copy>
</xsl:template>
<xsl:template match="*[namespace-uri() =
'http://www.example.com/pw/services/PWServices']">
<xsl:element name="{local-name()}">
<xsl:attribute name="type">
<xsl:value-of select="name()"/>
</xsl:attribute>
<xsl:apply-templates select="#* | node()"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
Against your sample will produce this result:
<?xml version="1.0" encoding="UTF-16"?>
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
<getAccountDTOResponse type="ns1:getAccountDTOResponse" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<getAccountDTOReturn soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="ns2:Account" xmlns:ns1="http://www.example.com/pw/services/PWServices" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns2="urn:PWServices">
<ID type="ns1:ID" soapenv:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="xsd:long">0</ID>
<accountNumber type="ns1:accountNumber" xsi:type="soapenc:string"></accountNumber>
<accountType type="ns1:accountType" xsi:type="soapenc:string"></accountType>
<clientData type="ns1:clientData" xsi:type="soapenc:Array" xsi:nil="true"></clientData>
<name type="ns1:name" xsi:type="soapenc:string"></name>
<parentRef type="ns1:parentRef" xsi:type="soapenc:string"></parentRef>
</getAccountDTOReturn>
</getAccountDTOResponse>
</soapenv:Body>
</soapenv:Envelope>