Supertype for all activity state types.

Item Summary
Name	Type	Multiplicity	Description
extension	container ExtensionType	[0,1]	Place for non-standard object properties.

Items
- extension
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  Place for non-standard object properties. The elements placed here will be handled exactly like the elements in the object body. It must NOT contain standard elements.