A question about BPEL data formats

Hi everyone,
I am new to BPEL and have a question regarding the format of data "inside" BPEL variables. Perhaps someone can clear this up?
When defining a variable in BPEL, I can either give it an XML Schema simple or complex type - or a "WSDL message type". I am confused with regard to the last one. A WSDL message has parts, and the parts have types themselves. These types, however, can be from an arbitrary type language. XML Schema is one possibility, but there might be others. I have two questions with regard to this:
1) If I use some proprietary schema instead of XML Schema, can I handle data in this format in the BPEL process? I.e., can I assign "literal" data to the parts in my own format, and (if it is XML-based) manipulate it with XPath?
2) WSDL allows the definition of styles and encodings in the concrete part. How does the conversion happen between what's on the wire (in the SOAP body) and inside the BPEL variables? I.e. when using RPC/Encoded, does the Oracle BPEL engine automatically convert everything into plain-XML-Schema-validated-XML and back or does RPC/Encoded XML show up inside the variables? What if the BPEL engine doesn't understand the concrete format?
Thanks a lot!
Reto

Fabio,
I am not sure I understood you clearly. But ODI uses the underlying technology of the target database to perform the CDC. There are several KMs for each technology that let you achieve the same.
eg. For Oracle, a trigger based CDC is available which creates triggers on the underlying tables in the database to capture the changes.
Also for Oracle, a Logminer based CDC is available which reads the Oracle logs to capture the changes made over to tables.

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