Hi Andreas,
> I would want to build a string from the SOAP parameter and other input parameters in the workflow,and then use those values later in the workflow, how would such a script look?
I didn't quite get the idea. Could you add a screenshot of the higher level workflow that you are building? To see what scripting elements you have and where you invoke the SOAP plug-in workflow. Because you are not invoking the workflow directly from the scripting element (i.e. using Javascript) but you're using a workflow invocation element inside your workflow, aren't you?
If the return type of a workflow is of type Property you shouldn't have problem to pass it to other workflows and to get the strings inside it.
Sergio