BPMN21 — Attribute Description of Class Signal missing

On page 281 Signal Events are described. The Class Diagram of SignalEventDefinition (Fig. 10.93) refers to a class called Signal with an attribute name and a relationship to ItemDefinition with the name structureRef. However, the attributes and model associations of this class are nowhere described in detail.

Remark: attributes and model associations are also missing for some Global Tasks (GlobalBusinessRuleTask, GlobalScriptTask and GlobalUserTask), however, in this case similar attribute descriptions are available for the classes BusinessRuleTask, ScriptTask and UserTask and might be taken (only problem is the difference described in Issue 15818).