This keyword's value MUST be an array. This array MUST have at least one element.
Elements of the array MUST be objects. Each object MUST be a valid JSON Schema.
An instance validates successfully against this keyword if it validates successfully against exactly one schema defined by this keyword's value.
Inline or referenced schema MUST be of a Schema Object and not a standard JSON Schema.
https://datatracker.ietf.org/doc/html/draft-wright-json-schema-validation-00#section-5.24
See Implementation
This keyword's value MUST be an array. This array MUST have at least one element.
Elements of the array MUST be objects. Each object MUST be a valid JSON Schema.
An instance validates successfully against this keyword if it validates successfully against exactly one schema defined by this keyword's value.
Inline or referenced schema MUST be of a Schema Object and not a standard JSON Schema.