anyOf: the union keyword. It holds a list of schemas, and a value is valid if it matches any of them. It is the one composite construct in the schema language. A union whose arms are all literals is a fixed set of choices ({anyOf: ["draft", "published"]}), which the editors show as a dropdown.

This document describes the schema/anyof type, one variant of the meta-schema. Its formal schema is attached as the schemaDefinition in this document's metadata, so the app can show it and create values of this type. Typed documents explains how that works.

A union lists alternative schemas under anyOf. A value is valid if it matches any of them. When every arm is a literal, the union is a fixed set of choices, such as {"anyOf": ["draft", "published", "archived"]}. The editors offer that union as a dropdown.

An empty union, {"anyOf": []}, accepts no values. The library names this schema none. It differs from the literal schema null, which accepts the single value null.

See also