BPMN2 — Meaning of + symbol on Communication undefined

Sections 11.4 and 11.5 don't defined the meaning of + symbol on
Communication. I thought it meant the expansion included at least one
communication. If this is the definition, then Figure 11-3 has a nested
communication symbol for Delivery Negotiations, but Figure 11-4 expands
it without a communication.

The definition given by the filer appears under Figure 11.4, but it is incorrect. The plus sign only indicates the presence of a SubConversation, or CallConversation to a
Collaboraton, as described in those sections.
In the paragraph under Figure 11.4 (Conversational view choreographies), next to last sentence, starting with "to alert", replace the rest of the sentence with ", indicating
a Sub-Conversation or a CallConversation calling a Collaboration."
Disposition: Resolved