The implementation of Activiti REST 5.16.4 always returns false for graphicalNotationDefined when getting process definition lists (the graphicalNotationDefined value is correct when fetching a single process definition). Unless the ProcessDefinitionEntity was fetched using repositoryService.getProcessDefinition() method (in previous version 5.16.3, each process definition in the list was re-fetched to get the correct value of graphicalNotationDefined), isGraphicalNotationDefined property will be false since its not persistent.
I think that isGraphicalNotationDefined should be persistent, additionally, isGraphicalNotationDefined() method should be exposed to the ProcessDefinition interface of the API. If you agree with me, I'll make the modifications and submit a pull request for this.
