| Note |
|---|
|
Transitive Closure Files are not distributed in the SNOMED CT International Release
The two file structures documented here are intended as points of reference for those generating transitive closure table from the release data. SNOMED International provides a script file that can be used to generating the first of these structures from the snapshot version of the Relationship File. |
Theis the complete set ofbetween everyand The
| Gloss |
|---|
| Space | true |
|---|
| t | Transitive Closure |
|---|
|
is the complete set of between every and each of its super-type
, in other words both its parents and
.
A transitive closure table is one of the most efficient ways to test for subsumption between concepts.
...
SNOMED International provides an example of a Transitive Closure Perl script file 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.
Field | Data type | Purpose | Part of Primary Key |
|---|
subtypeId | SCTID | Id of theplaying therole. Set to anof athe playing the role. Set to an of a . | YES |
supertypeId | SCTID | Id of theplaying the playing the supertype role. Set to anof aan of a . | YES |
Versioned Transitive Closure
A versioned view of thecan the
| Gloss |
|---|
| Space | true |
|---|
| t | Transitive Closure |
|---|
|
can also be generated by combining the snapshot views for different effective times and removing redundant rows (e.g. where the transitive closure has not changed between release versions). The generated file could then be represented using the example specification below. Note that the unique key for this file would consist of the
subtypeId,
supertypeId and
effectiveTime.
Field | Data type | Purpose | Part of Primary Key |
|---|
subtypeId | SCTID | Id of theplaying therole. Set to anof athe playing the role. Set to an of a . | YES |
supertypeId | SCTID | Id of theplaying the playing the supertype role. Set to anof aan of a . | |
effectiveTime | Time | Specifies the inclusive date at which therecord the | Gloss |
|---|
| Space | true |
|---|
| t | transitive closure |
|---|
|
record was added or changed its active state. | YES |
active | Boolean | Specifies whether at therepresented the | Gloss |
|---|
| Space | true |
|---|
| t | transitive closure |
|---|
|
represented by the subtypeId and superTypeId became validor invalidfrom valid or invalid from the point in time specified by the effectiveTime. | NO |
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