Draft 4

The draft 4 metaschema patch sets additionalProperties to false and adds the following properties to JSON Schema draft 4.

Tip

To reference the extended metaschema, use its canonical URI:

http://json-schema-extension.readthedocs.io/1__0__0/draft-04/metaschema.json

Note

The patch adds the $ref keyword which is implemented in JSON Schema draft 4, but missing from the metaschema.

Title	Description	Type	Format	Required
$ref		string
URI Reference	A reference to a statically identified schema. This keyword must be set to an absolute URI or a relative reference as defined by RFC 3986, where its fragment (if any) can consist of a JSON Pointer as defined by RFC 6901.
deprecatedDetails		object
Deprecated details	Information about the deprecation of the field. See deprecatedDetails
codelist		string
Codelist	The CSV file that defines the codes in the codelist that the field refers to.
openCodelist		boolean
Open codelist	Whether the codelist that the field refers to is an open codelist. This property was deprecated in version 1.0 This keyword is deprecated favour of using `enum` to indicate a closed codelist. A field refers to an open codelist when `codelist` is set without the presence of `enum`.
deprecated		object
Deprecated details	Information about the deprecation of the field. See deprecatedDetails This property was deprecated in version 1.0 This field is deprecated in favour of `deprecatedDetails` for forward compatibility with later versions of JSON Schema, which implement a boolean `deprecated` keyword.

deprecatedDetails

Information about the deprecation of the field.

Title	Description	Type	Format	Required
deprecatedVersion		string		Required
Version	The version in which the field was first deprecated.
description		string		Required
Description	A description of the reason for the field’s deprecation and information about its replacement, if any.