Precedence Property Pattern

• Description
• State-Based Pattern

Description

• Pattern in the original catalog
• Structured English Specification: [Scope], if P [becomes satisfied] then it must be that case that S [has been satisfied] before P [becomes satisfied].

State-Based Pattern

Untimed

Globally

The observer checks if S is reached before P: Once S is reached the Path does not interest us anymore, since the specification will be true. However if P is reached before S has ever occurred in a Path, the observer goes into an ERROR state, since the specification is not fulfilled in this case.

A[] not ERROR

Before R

A[] not ERROR

After Q

A[] not ERROR

Between Q and R

A[] not ERROR

After Q Until R

A[] not ERROR

Timed

• The timed version of the Precedence pattern, including its variance with Chains, is not applicable in UPPAAL. Any instance of S would have to be taken into consideration when evaluating an instance of P. UPPAAL, however, cannot handle arbitrary many variables, states, or arrays with arbitrary length.