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Options for reference collections

Some ODABA specific options can be defined for reference collections.

Definition: 

ref_option := guid | weak_typed | owner | update | unique | multiple_key | delete_empty | no_create

Subtopics

  1. global_identity - GUID Option
  2. week_typed - WEAK_TYPED option
  3. get_owning - OWNER option
  4. update - UPDATE option
  5. unique - UNIQUE option
  6. get_multikey - MULTIPLE_KEY option
  7. del_empty - DELETE_EMPTY option
  8. create - NO_CREATE option