JDev generated webservices encodes XML output from PL/SQL procedure

I have a PL/SQL packaged procedure which takes some input parameters and produces one output parameter. The output parameter is of type CLOB and after the procedure has run, it contains a big piece of XML data.
Using JDeveloper 10.1.3.1, I've published this packaged procedure as a webservice. The generated webservice is fine and works, except for one tiny little issue: the XML that is taken from the output parameter is encoded.
Here is an example of the SOAP message that the webservice returns:
<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ns0="http://gbv0300u/GBV0300U.wsdl/types/"><env:Body><ns0:gbv0300uResponse
Element><ns0:result><ns0:obvglijstOut> & gt;type>GBV0001& gt ;/type& lt;
& gt;diensten& lt;
& gt;dienst>some value& gt;/dienst& lt;
& gt;/diensten& lt;
</ns0:obvglijstOut></ns0:result></ns0:gbv0300uResponseElement></env:Body></env:Envelope>
(I've manually added an extra space between the & and lt; or gt; to make sure a browser will not translate it into a < or >!)
The contents of the <ns0:obvglijstOut> element are filled with the output parameter from the PL/SQL package.
How can I change the generated webservice, so the output from the PL/SQL package is used as is instead of being encoded?

Update: I've tested a bit more by adding some output statements to the java code that JDeveloper generated. I'm now 100% sure the PL/SQL code gives the XML data correctly to the webservice.
At this moment my guess is that somewhere in the WSDL definition there is something that enables the encoding of the data. But I'm not sure.
Any help is greatly appreciated.

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