# top level metadata concept

## top level metadata concept

A concept that is directly related to the SNOMED CT model component concept by a subtype relationship .

#### Notes

* The SNOMED CT model component concept is [900000000000441003 | SNOMED CT Model Component (metadata)|](http://snomed.info/id/900000000000441003) .
* All metadata concepts are subtype descendants of at least one *top level metadata concept.*
* The top level of the metadata hierarchy represents broad groups of metadata as follows:

[138875005 |SNOMED CT Concept|](http://snomed.info/id/138875005) ⬅︎ The root concept\
[900000000000441003 |SNOMED CT Model Component|](http://snomed.info/id/900000000000441003) ⬅︎ The root metadata concept\
[106237007 |Linkage concept|](http://snomed.info/id/106237007) ⬅︎ Attributes and other linkage concepts\
[370136006 |Namespace concept|](http://snomed.info/id/370136006) ⬅︎ Concepts representing namespaces\
[900000000000442005 |Core metadata concept|](http://snomed.info/id/900000000000442005) ⬅︎ Metadata supporting components\
[900000000000454005 |Foundation metadata concept|](http://snomed.info/id/900000000000454005) ⬅︎ Metadata supporting refsets

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