Reflects a list of all declared services (used within the workflow template's wf) that are
a) in the list of getSupportedServiceTypes();
b) use private or public modifiers within the implementing class
no corresponding setDeclaredWFServices as this is information is extracted implicitly from the code
Adds all additional service call specific information for a service which cannot be captured within the Service stub itself
but that are handed over by the xml config and that are required for invoking a certain operation.
An implementation of this interface can extend the WorkflowTemplateHelper util object, which provides all
methods that are required for the Factory for building a WorkflowInstance by reflection
except execute() and describe() - which need to be implemented by a WorkflowTemplate provider.