Absence of node intersections

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Purpose

The connecting nodes of an element should not overlap other connecting nodes. The comprehension and clarity of the model will suffer under the violation of this rule.

Positive examples

Negative examples

Description

Overlapping nodes make the diagram unnecessarily hard to read. Also, if nodes overlap, the model can be interpreted wrong. There are examples of overlapping Tasks and modeled message flows. Overlapping nodes should be moved respectively.