The Workflow PDT is used to create workflow process definitions. The PDT also contains a library for the business methods (both Business Process Object (BPO) and entity methods) which are available for use by the workflow process definitions.
The main function of the PDT is to create workflow process definitions by defining the activities in a workflow and the transitions between them. There are various activity types to choose from when creating a process definition, each one of which performs a different function. What occurs between the activities in a workflow depends on their transitions, the conditions for these transitions, and the data that is passed between them. For further details on workflow process definitions see Workflow Process Definitions.
The PDT comes equipped with a visualization tool which allows the workflow developer to view a version of the workflow process definition.
The PDT will also validate workflow process definitions before the workflow developer releases them. It will check the process definition against a series of validations and report any errors for the workflow process on the whole, for activities, or for transitions. These validations assist a developer in producing a valid and well formed workflow.