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The abstract logical model of

true
Gloss
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Caption ref
Typefigure
Idhigh-level
 provides a high-level view that illustrates the concept-centric design of 
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tSNOMED CT components
is illustrated below. The model is centered around the representation of
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Spacetrue
tconcepts
and their associated
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Spacetrue
trelationships
and subsections below describe the different elements illustrated here.

Image Added

Caption figure
Idhigh-level
High-level abstract view of the design of SNOMED CT

Concepts

Glossary include
Glossconcept
Suffix is defined as
Definline
Notetrue
PrefixA

Authors create a new 

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tSNOMED CT concept
 for each distinct clinical meaning added to the terminology.  Every 
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tconcept
 is uniquely identified and this identifier allows the concept to be unambiguously recorded in a clinical record. The concept identifier also allow other related information to be linked to a specific concept. This linked information includes human-readable terms and formal concept definitions. 

Descriptions

Glossary include
Glossdescription
Suffix is defined as
Definline
Notetrue
PrefixA

...

Terminology authors create a set of 

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Spacetrue
tdescriptions.
In terms of the alignment between
 each of which links a term to an identified concept. The linked terms must all be legitimate ways to label or refer to the concept to which they are linked. Translators also create
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Spacetrue
trelease files
and the logical model: Anchor_a8d6f5e7-ee2f-49c8-b79b-c908ed16aa26__7_a8d6f5e7-ee2f-49c8-b79b-c908ed16aa26__7

  • Gloss
    Spacetrue
    tSNOMED CT Release Format 2
    is closely aligned with the logical model;

  • A mapping table is provided with the

    Gloss
    Spacetrue
    tRelease Format 1
    file specification to map
    Gloss
    Spacetrue
    tRF1
    file structures to the abstract model.

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descriptions
 to link appropriate terms in other languages or dialects to the same 
Gloss
tconcepts
. Since usage of terms varies depending on languages and dialects, the design also support addition of information about which descriptions contain terms that are preferred or acceptable in each language or dialect.

Concept Definitions

Terminology authors associate each

Gloss
tconcept
 with a formal stated definition. This stated concept definition consists of
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tdescription logic
 axioms that are known to be true for that concept (for example stating that appendectomy is a procedure that applies the method excision to the appendix structure). Because these axioms are stated in a formal way, a 
Gloss
tdescription logic classifier
 can be applied to all the axioms in the terminology to generate additional logical inferences. Therefore, the overall model is designed to enable representation of both the original stated concept definition and the inferred view of the concept definition.

In practice, a 

Gloss
tdescription logic classifier
 can generate more than one inferred view, depending on whether all logically inferred axioms are retained and on whether some types of redundant axioms are omitted from the inferred view.

Other Related Information

The SNOMED CT design also enables a wide range of customizable information to be linked to the concepts and descriptions mentioned above. The extensible design of SNOMED CT enables consistent representation and distribution of:

  • subsets of concepts or descriptions
  • ordered lists of concepts or descriptions
  • language preferences associated with different descriptions
  • ordered or unordered associations between concepts
  • coded or plain text annotations linked to specific concepts
  • maps from concepts to codes in other code systems
  • representation of queries and expressions

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