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• Gloss
  t SNOMED CT

   enables navigation hierarchies to be specified using either:
  • an ordered association reference set in which the display order of nodes can be specified; or
  • an association reference set which the display order is not specified.
• The links in a navigation hierarchy do not contribute in any way to the semantic definitions of the linkedlinked 

  Gloss
  t concepts

  .
• A navigation hierarchy may include 

  Gloss
  t navigation concepts

   which are created to represent nodes in the hierarchy exist only to organize the hierarchy and cannot be selected for data entry.
• A navigation hierarchy may be limited to a subset of 

  Gloss
  t concepts

   relevant to a particular use case.
• Many different navigation hierarchies can be created, each specifying a structure that meets the needs of a particular use case.

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• Gloss
  t Navigation

• Gloss
  t Navigation concept

• Release File Specifications
  
  • 5.2.1.5 4 Association Reference Set
  • 5.2.1.6 5 Ordered Association Reference Set
• Terminology Services Guide
  • 6.2 Hierarchical Navigation
• Reference Sets Practical Guide
  • 5.4 . Association Reference Set
  • 5.5 . Ordered Association Reference Set