ENTITY project
				(* stuff that is already defined *)
			END_ENTITY;

			ENTITY project_measurements
				its_project : project;

				where:      address;
				when:        time_and_date;
				why:          label;
				Its_signals: LIST [1:?] OF Monitored_signal;
				measured_times :  OPTIONAL Monitored_time;
				its_tool_status :  LIST OF tool_status;
			END_ENTITY;

			ENTITY tool_status;
				Tool_identifier 		 identifier;
				Tool_number			OPTIONAL label;
				Tool_life  			time;
				Percentage_used_at_start 	ratio;
				Roughing_tool			OPTIONAL Boolean;
			END_ENTITY
				

			ENTITY monitored_Signal
				Label : 		OPTIONAL description
				Source: 		OPTIONAL identifier
				its_Results:		 LIST OF [1:?] Monitored_results
			END_ENTITY;

			ENTITY monitored_Time SUBTYPE_OF results;
				Its_times:		 bounded_curve
			END_ENTITY;

			TYPE monitored_results SELECT (
				Same_basis_results, different_basis_results, 
					discrete_results)
			END_TYPE;

// if workingstep is missing  then  between them
			ENTITY monitored_Results SUPERTYPE OF
				(same_basis_results, monitored_time
					Discrete_results, different_basis_results);
				Its_id :  		 identifier;
				Its_path:		OPTIONAL tool_path;
				Its_workingstep:	OPTIONAL workingstep
				Its_workplan:		workplan;
			END_ENTITY;


ENTITY same_basis_Results SUBTYPE_OF
				Monitored_results;
				Results:		 bounded_curve
			END_ENTITY;

// montioring system is expected to encode time or position in the results curve
			ENTITY different_basis_Monitored_Results SUBTYPE_OF results;
				Results:		 bounded_curve
			END_ENTITY;

			ENTITY discrete_result SUBTYPE_OF results;
				Value:			 STRING;
				Time:			OPTIONAL double;
				Postion:		OPTIONAL double
			END_ENTITY;