All SNOMED CT metadata concepts are subtypes of 900000000000441003 | SNOMED CT Model Component (metadata)| .
The top level of the metadata hierarchy represents broad groups of metadata as follows:

Top level of the SNOMED CT metadata hierarchy
900000000000441003 \| SNOMED CT Model Component (metadata)\| 106237007 \| Linkage concept (linkage concept)\| 370136006 \| Namespace concept (namespace concept)\| 900000000000442005 \| Core metadata concept (core metadata concept)\| 900000000000454005 \| Foundation metadata concept (foundation metadata concept)\|

Concept enumerations use metadata concepts to represent values that are applied to particular fields in release files.
Reference set types and reference set names are represented by metadata concepts that are subtypes of 900000000000455006 | Reference set (foundation metadata concept)| .

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