This section of the guide describes the

Terminology services
that are likely to be required to navigate
SNOMED CT
hierarchies.

One of the key strengths of

SNOMED CT
116680003|is a|
rich set of
relationships
that connect the
concepts
within the terminology. The primary use of these
relationships
is to facilitate selective retrieval. However, some of these
relationships
are arranged in hierarchies that can be navigated using an appropriate user-interface control. For example, the
subtype hierarchy
formed by the
116680003|is a|
relationships
can be used to navigate from a selected
concept
to another
concept
that has a more specific or less specific meaning.

SNOMED CT
also specifies standard ways to represent multiple
navigation
hierarchies that can be designed to meet different requirement. Unlike
relationship
based hierarchies,
navigation
hierarchies convey no semantic information but are intended to be used to enhance the user experience when navigating through the terminology.