3.4. Metadata Hierarchy

As the formats contain a number of enumerations, it is necessary to define sets of that represent the allowed values. As well as the enumerated values, other metadata supporting the extensibility mechanism and the is required.

The |SNOMED CT Model Component (metadata)| is a of the ( |SNOMED CT Concept| ), and contains the metadata, supporting the release.

The of |SNOMED CT Model Component (metadata)| are described in and the top three levels of the hierarchy are shown in .

Table 15. SNOMED CT Model Component (metadata) (900000000000441003)
Id	Term	Comment
106237007	106237007	that specify Semantic between ( \|Attribute\| ); and Asserted associations between statements in a record ( \|Link assertion\| )
370136006	370136006	that specify the Namespaces allocated by the .
900000000000442005	900000000000442005	that are referenced from enumerated fields within the files (the , , , Identifier file ).
900000000000454005	900000000000454005	The metadata that supports the extensibility mechanism, and is discussed in more detail in the .

138875005 |SNOMED CT Concept|
- ... (content hierarchies) ...
- 900000000000441003 |SNOMED CT Model Component|

Figure 2. SNOMED CT Metadata Hierarchy (2010-07-31)

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3.4. Metadata Hierarchy