Associations between Component Files
The logical model of
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between the components in the release files is shown in
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. The component class represents columns present in all three component files. The individual classes (description, concept and relationship) only show the additional columns present in those files. The colored lines between descriptions and concepts and between relationships and concepts represent the link between the foreign keys (shown in bold) and the id of the concept. These provide the functional connections between components described in this document. The grey lines indicate additional links between columns that are populated with concept identifiers that provide enumerated values.
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Logical Relationships Between Component Files |
A More Complete View of Release File Associations
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provides an extended view of the associations between release files following changes complete in July 2019 release of SNOMED CT
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The associations shown on the page are the results of changes that occured between July 2018 and July 2019. For documentation file associations before these changes please refer to Associations Between Release Files Prior to July 2018. |
. These changes enable SNOMED CT to use enhanced
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features and resulted in a significant change to the way in which the
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of
are represented. However the changes but did not significantly affect the structure and associations between the main component files shown
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in
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Associations between SNOMED CT Release Files |
Detailed Notes of Release File Associations
Each
is represented by a row in the
and the concept is identified by the id column in that row. There can be more than one row with the same id but with different effectiveTime values, in which case each of these rows represents a version of that same concept. Thus each row represents a version of a clinical
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The most basic form of
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is the
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t | 116680003|is a| |
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relationship. This relationship states that one
is a subtype of another
. Each subtype concept is connected to its parent subtype(s) by relationships with the typeId
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t | 116680003|is a| |
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and this form the main SNOMED CT
In this
a
may have more than one parent
. The root of the
is
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t | 138875005 |SNOMED CT Concept| |
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, which has a set of top level
each forming its own
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t | sub-hierarchy. |
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|
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t | Relationships |
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with typeid values that are subtypes of
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t | 410662002 |Concept model attribute| |
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are referred to as attribute relationship and contribute to the formal definition of the source concept.
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