The mime-resolver in websvc/core and websvc/jaxrpcsupport resolves all files
with .wsdl extension to "text/xml-wsdl" mime type.

But the WsdlDataLoader sets the mime type to "text/xml", so that it can leverage
the xml editor kit and xml syntax.

But if you set it as text/x-wsdl+xml then this automatically selects the xml
editor kit and xml syntax.

Schema and bpel editors already use this type of mime type text/x-schema+xml and
text/x-bpel+xml.

This blocks the wsdl editor from using text/x-wsdl+xml, since the websvc
resolves it to text/xml-wsdl.