>I have a Web Service which I need to use which contains some complex type namespace. Basically, additionnally to using standard field types, such as string and int, this Web Service also makes reference to complex type namespace. So, those parameters are making reference to a complex type namespace structure. I am trying to understand the use for such an approach, what does it mean and how to be compliant with that.

One of the UC for complex XML data types stems from the way AXXIS [main java tool for WS] fits java general usuage.
Usually Biz objects [for instance implemented as pojo] will be serialized into a complex XML type and re-used in other WSDL's.

Strategy to work against I pick after talking to the developers of the WS I need to integrate.

HTH

thomas