Limitations of JDeveloper WebServicesAssembler

I'm attempting top-down deployment of a stateless document literal web service using WebServicesAssembler (OC4J 10.1.2). I am supplying the WSDL which is split into two files - deployment and abstract. The abstract WSDL imports a couple of schemas which are used for messages.
This is surely a typical deployment for web services written for published schemas but WebServicesAssembler doesn't seem to support it. Does anybody know any different or if there is any documentation on manually assembling a web services application to work with the Oracle servlets (e.g. StatelessJavaDocWebService).
I tried combining the WSDL into a single file which deploys OK but accessing the endpoint page shows the message "Error parsing the WSDL for this Endpoint" and a NullPointerException.
Thanks
Andy

Thanks for the info and link.
By "not good" do you mean that there is some support for imports in 10.1.2?
Would the following be possible?
<types>
<schema xmlns="http://www.w3.org/2001/XMLSchema"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
          targetNamespace="http://namespace.co.uk">
<import schemaLocation="NeSSDataCubeQueryMessage-v0-2.xsd"
namespace="http://namespace.co.uk" id="ndc"/>
</schema>
</types>
<message name="getDataCube">
<part name="parameters" element="ndc:NeSSDataCubeQueryMessage"/>
</message>
If not possible in 10.1.2 is this supported in 10.1.3?
Thanks again,
Andy

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