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Transitive Closure Files are not distributed in the SNOMED CT International Release |
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A transitive closure table is one of the most efficient ways to test for subsumption between concepts.
Snapshot Transitive Closure File
SNOMED International provides an example of a Transitive Closure Perl script file (click to download) that can be used to generating a snapshot view of the transitive closure from the snapshot release of the relationship file
. The output of this script conforms to the following following file structure. Note that the primary key for this table consists of both columns.Specref RefType file t Relationship
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Purpose
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subtypeId
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Id of theplaying therole. Set to anof a.
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Transitive Closure File - Detailed Specification |
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supertypeId
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Id of theplaying the supertype role. Set to anof a.
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Versioned Transitive Closure
A versioned view of thecan the
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Field
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Purpose
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subtypeId
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Id of theplaying therole. Set to anof a.
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supertypeId
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Id of theplaying the supertype role. Set to anof a.
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YES
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Specifies the inclusive date at which therecord became valid.
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Specifies whether theversion's state wasorfrom the point in time specified by the effectiveTime (field) .
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Versioned Transitive Closure File - Example Specification |
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