> 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/e6-concept-enumerations-for-modifierid.md).

# E.6 Concept Enumerations for modifierId

This concept enumeration represents a value that can be applied to the relationship. modifierId field. This is used to indicate the type of Description Logic (DL) restriction (some, all, etc.) that applies to the relationship. The Table below shows the current set of values for this concept enumeration.

**Modifier (core metadata concept) (900000000000450001)**

<table data-full-width="true"><thead><tr><th width="276.115478515625"></th><th></th></tr></thead><tbody><tr><td><strong>Concept</strong></td><td><strong>Comment</strong></td></tr><tr><td><a href="http://snomed.info/id/900000000000451002">900000000000451002 |Existential restriction modifier (core metadata concept)|</a></td><td>Indicates that description logic restriction represented by this defining relationship applies to <strong>some</strong> aspect of the concept.</td></tr><tr><td><a href="http://snomed.info/id/900000000000452009">900000000000452009 |Universal restriction modifier (core metadata concept)|</a></td><td><p>Indicates that description logic restriction represented by this defining relationship applies to <strong>all aspects</strong> of the concept.</p><p>This value is not used for any concepts.</p></td></tr></tbody></table>

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