FUML12 — The fUML subset should include central buffer nodes and data stores

Specification: Semantics of a Foundational Subset for Executable UML Models, FTF Beta 3 (ptc/10-03-14)

Unlike pins, the tokens in central buffer nodes and data stores (which are kind of central buffer node) are not consumed when they are accessed. This allows a value to be, e.g., stored in a data store and used repeatedly in a loop that is modeled directly using flows rather than using a loop node. It is more common to create loops using flows than structured nodes when drawing graphical activity diagrams, and fUML should provide reasonable execution semantics for such models using central buffer nodes and data stores.

Defer

The RTF agrees this issue needs resolution but, due to lack of time, is deferring its resolution to the next RTF.