additionalProperties and additionalItems

[Jack Wootton]

Hi,

The latest spec defines additionalProperties as:

The value of "additionalProperties" MUST be a valid JSON Schema.

Historically additionalProperties use to be a boolean,

additionalProperties: true | false 

My understanding is that it then became boolean for false OR a valid JSON Schema:

additionalProperties: false 

additionalProperties: { type: "string" }

The latest spec states that it may now only be a valid JSON Schema.

Questions.

If only valid schema is allowed, how does one denote no additional schemas?

Best,

Jack

[Henry Andrews]

Hi Jack,

  If you take a look at the latest JSON Schema Core spec you will see that booleans are now considered valid JSON Schemas and may appear anywhere a schema object can appear.  true is equivalent to {}, and false is equivalent to {"not": {}}.  So "additionalProperties" and "additionalItems" have not changed, they're just not special cases anymore.

thanks,

-henry

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From: Jack Wootton <jackw...@gmail.com>
To: json-...@googlegroups.com
Sent: Tuesday, January 9, 2018 6:51 AM
Subject: [json-schema] additionalProperties and additionalItems

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