XPath failing for namespaced XML via SQL EXTRACTVALUE? - sql

Question

I have am trying to parse FaultMessage from an XML response using EXTRACTVALUE. Below is my SQL code:
SELECT EXTRACTVALUE( XMLTYPE('
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<s:Fault>
<faultcode>s:Client</faultcode>
<faultstring xml:lang="tr-TR">İstek şeması doğrulanamadı. Lütfen tüm bilgileri kontrol edin.</faultstring>
<detail>
<Fault xmlns="http://schemas.datacontract.org/2004/07/CustomServiceLibrary.DataContract" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<FaultCode>Schema_Customer_005|1e8c66-c333-4357-9c7d-3f4fcd553</FaultCode>
<FaulCategory>Schema</FaulCategory>
<FaultMessage> Customer name can not be blank, can not contain spaces, or any special characters. LASTNAMEFIRSTNAME is the required format. </FaultMessage>
<FaultDetailedMessage>UMUT DEMIRCI</FaultDetailedMessage>
</Fault>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>'),
'/s:Envelope/s:Body/s:Fault/detail/*:Fault/FaultMessage',
'xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" xmlns:a="http://schemas.datacontract.org/2004/07/CustomServiceLibrary.DataContract" ') a
FROM DUAL
Please suggest how I can get FaultMessage.

Answer 1

Given:
The deeper Fault element and its descendents are in the http://schemas.datacontract.org/2004/07/CustomServiceLibrary.DataContract namespace.
You appear to have already defined the a namespace prefix for http://schemas.datacontract.org/2004/07/CustomServiceLibrary.DataContract
Using * as a wildcard for a namespace prefix requires XPath 2.0+.
Change
/s:Envelope/s:Body/s:Fault/detail/*:Fault/FaultMessage
to
/s:Envelope/s:Body/s:Fault/detail/a:Fault/a:FaultMessage
so that your XPath will be correct and not require an XPath 2.0+ processor.