BPMN2 — Are Conditional Start Events executable?

Are ConditionalStartEvents executable? What data are they able to access?

Note that the spec states that executable ConditionalStartEvents must have a FormalExpression. So the spec implies they are executable. But it doesn't provide guidance on what data context would be provided for that FormalExpression.

Section 10.4.2 Start Event
Table 10.3 - Top-Level Process Start Event Types
Change row: Conditional
Original (Description column)
This type of event is triggered when a Condition such as "S&P 500 changes by more than 10% since opening", or "Temperature above 300C" become true. The
Condition Expression for the Event must become false and then true before the Event can be triggered again.
If there is only one (1) EventDefinition associated with the Start Event and that EventDefinition is of the subclass ConditionalEventDefinition, then the Event is a
Conditional Start Event and MUST be displayed with a lined paper marker (see the figure to the right).
Proposal (Description column)
This type of event is triggered when a Condition such as "S&P 500 changes by more than 10% since opening", or "Temperature above 300C" become true. The
Condition Expression for the Event must become false and then true before the Event can be triggered again.
The Condition Expression of a Conditional Start Event MUST NOT refer to the data context or instance attribute of the process (as the Process instance has not yet
been created). Instead, it may refer to static process attributes and states of entities in the environment. The specification of mechanisms to access such states is out of
scope of the standard.
If there is only one (1) EventDefinition associated with the Start Event and that EventDefinition is of the subclass ConditionalEventDefinition, then the Event is a
Conditional Start Event and MUST be displayed with a lined paper marker (see the figure to the right).
Disposition: Resolved