Do the proposed diagrams conform to BPMN notation?

To determine whether the proposed notation schemes conform to BPMN, the following key elements should be checked:

• Use of standard BPMN symbols: events (circles), tasks (rectangles with rounded corners), gateways (diamonds).
• Correct flow of control and message flows.
• Proper use of subprocesses and events.

If non-standard symbols are used or the flow logic is violated, then they do not conform to BPMN. Specialized modeling tools that validate diagrams according to the BPMN standard can be used for verification.