[castor-dev] marshalling and unmarshalling using xsi:type with namespace content

[Noel . Verhoeven]

I'm trying to unmarshal an xml doc that contains element whose type is 
identified by xsi:type attributes. The type may be from the root xml 
schema or from a complexType derived from a root complexType in another 
xml schema.
In order to have valid xml docs I need to have somthing like:

  <root:myElement xsi:type="derived:aDerivedElementType">
            <derived:someElement />
   </root:myElement>
However, the unmarshaller is not able to instantiate this derived 
element, because I get an 'unable to find fielddescriptor for 
someElement in MyElement', as if it does not see the derived tyope but 
only the root type.

I can solve this by using the java: mapping as follows:
  <root:myElement 
xsi:type="java:com.myproject.derivedpackage.aDerivedElementType">
            <derived:someElement />
   </root:myElement>
in which the aDerivedElementType class is the generated class in the 
package com.myproject.derivedpackage. This is not a valid xml file however.
I have put this mapping of package to namespace in the 
castrobuilder.properties file:

org.exolab.castor.builder.nspackages=\
 http://www.myproject.com/root=com.myproject.rootpackage, \
 http://www.myproject.com/derived=com.myproject.derivedpackage
Now, if I marshal the unmarshalled object structure, I get an xml file 
that contains the initial xsi:type="derived:aDerivedElementType" again.

How can I use xsi:type="derived:aDerivedElementType"  (using the 
namespace) in order to do the unmarshalling?
Thanks for any info/help/brilliant ideas

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