JSON schema : “allof” with “additionalProperties”

Question

Suppose we have schema following schema (from tutorial here):

{
  \"$schema\": \"http://json-schema.org/draft-04/schema#\",

  \"definitions\": {
    \"addr         


        

Answer 1

additionalProperties applies to all properties that are not accounted-for by properties or patternProperties in the immediate schema.

This means that when you have:

    {
      "allOf": [
        { "$ref": "#/definitions/address" },
        { "properties":
          { "type": { "enum": [ "residential", "business" ] } },
          "required": ["type"]
        }
      ],
      "additionalProperties":false
    }

additionalProperties here applies to all properties, because there is no sibling-level properties entry - the one inside allOf does not count.

One thing you could do is to move the properties definition one level up, and provide stub entries for properties you are importing:

    {
      "allOf": [{"$ref": "#/definitions/address"}],
      "properties": {
        "type": {"enum": ["residential", "business"]},
        "addressProp1": {},
        "addressProp2": {},
        ...
      },
      "required": ["type"],
      "additionalProperties":false
    }

This means that additionalProperties will not apply to the properties you want.