> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/r/root-metadata-concept.md).

# root metadata concept

## root metadata concept

**This is a synonym for SNOMED CT model component concept.**

## SNOMED CT model component concept

The concept that represents the top of the hierarchy of metadata concepts.

#### Notes

* This *SNOMED CT model component concept* has the identifier [900000000000441003 | SNOMED CT Model Component (metadata)|](http://snomed.info/id/900000000000441003) .
* 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

## Alternatives

* **Root metadata code**

##

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