UML14 — concurrent vs. parallel ExpansionRegions

The 3rd rev. draft of UML 2's superstructure document introduces the
keywords "parallel", "iterative", and "stream" for ExpansionRegions
(p.
292).

But the example figures given at page 296 uses "concurrent" instead of
"parallel" without any introduction.

Finally, the metamodel type ExpansionKind (p. 248) solely defines
"parallel" and the other two keywords mentioned above. "concurrent" is
completely missing.

Sure, there is a distinction between concurrency (pseudo-parallel
execution of processes or threads on one single CPU) and parallelity
(parallel execution of processes or threads on multiple CPUs) but I'm
not convinced if we should introduce this distinction at the
specification level.

Any ideas?

Duplicate with 6099.