> 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-ct-specifications/snomed-ct-release-file-specification/appendices/appendix-e-concept-enumerations/e8-concept-enumerations-for-reference-set-attribute-values.md).

# E.8 Concept Enumerations for Reference Set Attribute Values

Subtypes of the 900000000001073010 | Attribute value| provide sets of values for use in specific attributes of specific types of reference sets. Exhibit E.8-1 shows some of the values in this part of the metadata hierarchy. Additionally branches of the hierarchy can be added to support new requirements for specific reference set types.

**Exhibit E.8-1: Reference Set Attribute Values**

|                                                                |
| -------------------------------------------------------------- |
| [900000000001073010](http://snomed.info/id/900000000001073010) |

***

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