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The wrapper can also be used at sink side, i.e. to send data from Odysseus to other systems. In this case, the information is send from the datahandler via the protocol handler to the transport handler. Each handler can provide both ways, i.e. retrieving and sending of data but is not required to. So some handler may only be used in sources, while other only in sinks.
Here are two sequence diagramms that show via an example how the different handler interoperate:
This document explains how to write new wrappers using this generic wrappers.
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