id: unique_key
schema_generating: true
description: a collection of slots whose values uniquely identify an instance of a
  class
display_name: unique_key
document_category: unique_key
weight: 20
fields:
- id: unique_key_slots
  description: list of slot names that form a key
  display_name: unique_key_slots
  cardinality: multi
- id: extensions
  description: a tag/text tuple attached to an arbitrary element
  display_name: extensions
  cardinality: multi
- id: annotations
  description: a collection of tag/text tuples with the semantics of OWL Annotation
  display_name: annotations
  cardinality: multi
