Information about individual activity run. Needed e.g. to compute real throughput.

Item Summary
Name	Type	Multiplicity	Description
startTimestamp	property dateTime	[0,1]	When the run started.
endTimestamp	property dateTime	[0,1]	When the run ended (or current time, in order to avoid information loss).

Items
- startTimestamp
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  When the run started.
- endTimestamp
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  When the run ended (or current time, in order to avoid information loss).