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

Item Summary
Name	Type	Multiplicity	Description
$itemDefinition.Name.LocalPart	property boolean	[0,1]
$itemDefinition.Name.LocalPart	property CacheInvalidationApproximationType	[0,1]

Items
- $itemDefinition.Name.LocalPart
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
- $itemDefinition.Name.LocalPart
  
  Flags: RAM,runtime,AVals:2
  
  Multiplicity: [0,1]