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The Root Concept
All other Concepts are descended from this "root" concept via at least one series of Relationships of the Relationship Type 116680003 |is a|(i.e. all other Concepts are regarded as subclasses of this Concept).
Features of the root Concept
Release information in the root Concept
Concept has a current Synonym that contains information about the release. The Synonyms, representing earlier releases, are distributed as Inactive Descriptions. The release information is represented in the term text of the Synonym as indicated in .The root
Table 4.1-1: Representation of release information in the root Concept
SNOMED Clinical Terms version: 20020131 [R] (first release)
The release date in ISO format.
R (release), D (developmental) or E (evaluation).
An optional free text description of the release.
Concepts that are directly related to the Root Concept by a single Relationship of the Relationship Type 116680003 |is a|are referred to as "Top Level Concepts". All other concepts are descended from at least one Top Level Concept via at least one series of Relationships of the Relationship Type 116680003 |is a|(i.e. all other concepts represent subclasses of the meaning of at least one Top Level Concept).
Table 4.1-2: Top Level Concepts
Representation of top-level Concepts
Concepts is likely to be particularly important when developing technical implementations.Awareness of the top-level
A top-level Concept can be identified by the fact that it has a single subtype relationship referring to the Root Concept. However, to minimize processing requirements the top-level Concepts have designated Concept Identifiers that are documented in this guide asImportant Concept Identifiers.
Top Level Metadata Concepts
Concepts represent broad groups of metadata.Metadata codes represent structural information about the terminology itself. The Top Level Metadata
Table 4.1-3: Top Level Metadata