xquery: how to remove unused namespace in xml node? - xquery

Question

I have a xml document same as:
<otx xmlns="http://iso.org/OTX/1.0.0" xmlns:i18n="http://iso.org/OTX/1.0.0/i18n" xmlns:diag="http://iso.org/OTX/1.0.0/DiagCom" xmlns:measure="http://iso.org/OTX/1.0.0/Measure" xmlns:string="http://iso.org/OTX/1.0.0/StringUtil" xmlns:dmd="http://iso.org/OTX/1.0.0/Auxiliaries/DiagMetaData" xmlns:fileXml="http://vwag.de/OTX/1.0.0/XmlFile" xmlns:log="http://iso.org/OTX/1.0.0/Logging" xmlns:file="http://vwag.de/OTX/1.0.0/File" xmlns:dataPlus="http://iso.org/OTX/1.0.0/DiagDataBrowsingPlus" xmlns:event="http://iso.org/OTX/1.0.0/Event" xmlns:quant="http://iso.org/OTX/1.0.0/Quantities" xmlns:hmi="http://iso.org/OTX/1.0.0/HMI" xmlns:math="http://iso.org/OTX/1.0.0/Math" xmlns:flash="http://iso.org/OTX/1.0.0/Flash" xmlns:data="http://iso.org/OTX/1.0.0/DiagDataBrowsing" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dt="http://iso.org/OTX/1.0.0/DateTime" xmlns:eventPlus="http://iso.org/OTX/1.0.0/EventPlus" xmlns:corePlus="http://iso.org/OTX/1.0.0/CorePlus" xmlns:xmime="http://www.w3.org/2005/05/xmlmime" xmlns:job="http://iso.org/OTX/1.0.0/Job" id="id_4e5722f2f81a4309860c146fd3c743e5" name="NewDocument1" package="NewOtxProject1Package1" version="1.0.0.0" timestamp="2014-04-11T09:42:50.2091628+07:00">
<declarations>
<constant id="id_fdc639e20fbb42a4b6b039f4262a0001" name="GlobalConstant">
<realisation>
<dataType xsi:type="Boolean">
<init value="false"/>
</dataType>
</realisation>
</constant>
</declarations>
<metaData>
<data key="MadeWith">Created by emotive Open Test Framework - www.emotive.de</data>
<data key="OtfVersion">4.1.0.8044</data>
</metaData>
<procedures>
<procedure id="id_1a80900324c64ee883d9c12e08c8c460" name="main" visibility="PUBLIC">
<realisation>
<flow/>
</realisation>
</procedure>
</procedures>
</otx>
I want to remove unsused namespaces in the xml by xquery but i don't know any solution to solving it. the current namespace used are "http://iso.org/OTX/1.0.0 and http://www.w3.org/2001/XMLSchema-instance".
please help me!.

Answer 1

Unfortunately, XQuery Update provides no expression to remove existing namespaces, but you can recursively rebuild your document:
declare function local:strip-ns($n as node()) as node() {
if($n instance of element()) then (
element { node-name($n) } {
$n/#*,
$n/node()/local:strip-ns(.)
}
) else if($n instance of document-node()) then (
document { local:strip-ns($n/node()) }
) else (
$n
)
};
let $xml :=
<A xmlns="used1" xmlns:unused="unused">
<b:B xmlns:b="used2"/>
</A>
return local:strip-ns($xml)