> For the complete documentation index, see [llms.txt](https://gitbook.semantify.it/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook.semantify.it/domainspecifications/ds-v2/grammar/domainspecification/restrictedenumeration.md).

# Grammar Documentation for node type "RestrictedEnumeration"

This is a node specifying the usage of a restricted enumeration, hence an enumeration from Schema.org that has constraints on the allowed instance values (Which enumeration instances are allowed).

![Syntax diagram](https://430735439-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MXl6YtFKrJ1dUqsLouU%2Fsync%2Ff3205338bd314f7b09107ba7492754593bedfac8.png?generation=1617879604623069\&alt=media)

## $type

**Required**. Has always the string "RestrictedEnumeration" as value.

Based on "@type" from JSON-LD (Indicates the type of the node/object). This value is a short form for the URI identifying this node type in the DS grammar.

## $enumeration

**Required**. Has always a string as value.

Indicates the enumeration from Schema.org which is referenced here. The enumeration is specified in a short form instead of the URI ("BookFormatType" instead of "<https://schema.org/BookFormatType>").

## expectedEnumerationValues

**Required**. Has always an array as value.

Specifies the allowed enumeration instances for this enumeration. The values in this array must have one of the following $types:

* EnumerationValue
* CustomEnumerationValue

## name

**Optional**. Has always a string as value.

Same as the property "name" from Schema.org (meta information about the entity).

## description

**Optional**. Has always a string as value.

Same as the property "description" from Schema.org (meta information about the entity).