Differences between bpel client api and workflow api

can anyone help me with the differences between the two bpel apis.
i think the client is just to interact with the server (invoking processes and completing tags) , and the workflow is to interact with processes definitions and more deeply detail of the processes. is this true ?
can anyone hand me some workflow api usage ?
thanks in advance for any help

Hi ,
workflow apis are more to do with the taskservice which gets invoked on every human task of a bpel process.
Client apis have more to do with metadata and execution of bpel process .
Cheers :)

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