Unevaluated Vocabulary Official Included By Default

A mandatory vocabulary that defines keywords that apply subschemas to array items or object properties that have not been successfully evaluated against any dynamic-scope subschema of any adjacent keywords.

To make use of this vocabulary, modify your metaschema to declare the use of this vocabulary using the $vocabulary keyword and evaluate its metaschema. If the vocabulary must be present for an implementation to proceed:

{
  ...
  "$vocabulary": {
    ...
    "https://json-schema.org/draft/2020-12/vocab/unevaluated": true
  },
  "allOf": [
    { "$ref": "https://json-schema.org/draft/2020-12/meta/unevaluated" }
  ]
}

Otherwise, if it is optional for implementations to understand this vocabulary to proceed:

{
  ...
  "$vocabulary": {
    ...
    "https://json-schema.org/draft/2020-12/vocab/unevaluated": false
  },
  "allOf": [
    { "$ref": "https://json-schema.org/draft/2020-12/meta/unevaluated" }
  ]
}

Keywords

Keyword Kind Instance Summary
unevaluatedItems Applicator Annotation Array Validates array elements that did not successfully validate against other standard array applicators.
unevaluatedProperties Applicator Annotation Object Validates object properties that did not successfully validate against other standard object applicators.