The InstanceDefinitionTable type exposes the following members.
Number of items in the instance definitions table, excluding deleted definitions.
Number of items in the instance definitions table.
Document that owns this table.
Conceptually, the InstanceDefinition table is an array of Instance definitions. The operator can be used to get individual instance definition. An instance definition is either active or deleted and this state is reported by IsDeleted or will be null if it has been purged from the document.