| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /xml |
| Set a concise non-empty title at the top level of the schema to explain what the definition is about | |
| Set a non-empty description at the top level of the schema to explain what the definition is about in detail | |
| Set a non-empty examples array at the top level of the schema to illustrate the expected data | |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/authorities/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/authorities/items/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/content/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/creators/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/creators/items/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/languages/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/languages/items/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/locations/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/locations/items/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/rightsholders/xml |
| Future versions of JSON Schema will refuse to evaluate unknown keywords or custom keywords from optional vocabularies that don't have an x- prefix | /properties/rightsholders/items/xml |