Efficient Semantics-Based Compliance Checking Using LTL Formulae and Unfolding

Algorithm 7

Determining the (unary) basic predicate alwoccur.

function  ALWOCCUR

Input: A taskID 𝑡, a process model 𝑟

Output: A boolean value

begin

 𝔾∶=  RetrieveBigraphs(𝑟);

 return _𝐺⋀_∈𝔾(RetrieveAllEvents(𝐺,𝑡)≠∅)