As the release file formats contain a number of concept enumerations, it is necessary to define sets of concepts that represent the allowed values. As well as the enumerated values, other metadata supporting the extensibility mechanism and the concept model is required.
The concept 900000000000441003 | SNOMED CT Model Component (metadata)| is a subtype of the root concept (138875005 |SNOMED CT Concept|), and contains the metadata, supporting the release.
The subtypes of |SNOMED CT Model Component (metadata)| are described in the following table and the top three levels of the hierarchy are shown in the figure below this.
SNOMED CT Model Component (metadata)
SNOMED CT Metadata Hierarchy (2018-01-31) - Core metadata concepts (top 3 levels only)
... (see next table)
SNOMED CT Metadata Hierarchy (2018-01-31) - Foundation metadata concepts (top 3 levels only - some long lists replaced by ...)
... (see previous table) ... ... ...
106237007
|Linkage concept (linkage concept)|
Concepts that specify
Semantic Relationships between concepts (246061005 |Attribute|); and
Asserted associations between statements in a record (416698001 |Link assertion|).
370136006
|Namespace concept (namespace concept)|
Concepts that specify the Extension Namespaces allocated by the SNOMED International.
900000000000442005
|Core metadata concept (core metadata concept)|
Concepts that are referenced from enumerated fields within the International Release files (the Concept, Description, Relationship, Identifier).
900000000000454005
|Foundation metadata concept (foundation metadata concept)|
The metadata that supports the extensibility mechanism, and is discussed in more detail in the .
762947003
|OWL metadata concept (OWL metadata concept)|
The OWL metadata concept has subtypes that are used in the OWL reference sets to provide a referencedComponent for some of the definitions or axioms that are required.