UML22 — Section: 12.3.37 ObjectFlow

On page 418, Constraints (BasicActivities), you write: "[1] Object flows may not have actions at either end." In contrast, on page 420, Notation, the description of the upper right part of figure 281 is: "Two object flow edges linking object nodes and actions(!!)." After many cycles of re-reading the Activities chapter I got convinced that the constraint is really meant as-is. So, the notation mentioned above likely means the "standalone pin notation" from page 433. If so, you should make it very clear, that this notation maps to two Pin instances (one at either action) and ONE ObjectFlow instance in-between, in the model (just like the alternative notation in the same figure shows). In addition, you should add this clarification throughout the Activities chapter. In addition, on page 433, regarding the explanation of the standalone pin notation, you should add, that it maps to ONE object flow edge in-between the two pins, in the model.

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