How is the cache invalidated? Currently applicable only to global repo cache objects.

Item Summary
Name	Type	Multiplicity	Description
clusterwide	property boolean	[0,1]	Whether to do clusterwide invalidation.
approximation	property CacheInvalidationApproximationType	[0,1]	When doing clusterwide invalidation, operation details (for add/modify/delete operation) are currently not available.

Items
- clusterwide
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  Whether to do clusterwide invalidation. Default is true.
- approximation
  
  Flags: RAM,runtime,AVals:2
  
  Multiplicity: [0,1]
  
  When doing clusterwide invalidation, operation details (for add/modify/delete operation) are currently not available. This parameter controls how to deal with this situation.