JSON模式：带有“additionalproperties”的“Allof”

Question

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

  "definitions": {
    "address": {
      "type": "object",
      "properties": {
        "street_address": { "type": "string" },
        "city":           { "type": "string" },
        "state":          { "type": "string" }
      },
      "required": ["street_address", "city", "state"]
    }
  },

  "type": "object",

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

  }
}

{
      "shipping_address": {
        "street_address": "1600 Pennsylvania Avenue NW",
        "city": "Washington",
        "state": "DC",
        "type": "business"
      }
}

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

[ {
  "level" : "error",
  "schema" : {
    "loadingURI" : "#",
    "pointer" : "/properties/shipping_address"
  },
  "instance" : {
    "pointer" : "/shipping_address"
  },
  "domain" : "validation",
  "keyword" : "additionalProperties",
  "message" : "additional properties are not allowed",
  "unwanted" : [ "city", "state", "street_address", "type" ]
} ] 

问题是：我应该如何仅限制shipping_address部分的字段？提前谢了。

Answer 1

[这里是v4验证规范草案的作者]

您已经偶然发现了JSON模式中最常见的问题，即它根本无法像用户期望的那样进行继承；但同时也是其核心特征之一。

当您这样做时：

"allOf": [ { "schema1": "here" }, { "schema2": "here" } ]

• StrictProperties,
• 合并。

那么shipping_address的架构将是：

{
    "merge": {
        "source": { "$ref": "#/definitions/address" },
        "with": {
            "properties": {
                "type": { "enum": [ "residential", "business" ] }
            }
        }
    }
}

同时在address中将strictproperties定义为true。

{
    "extends": { "type": "null" },
    "type": "string"
}

现在，那个：

{
    "allOf": [ { "type": "string" }, { "type": "null" } ]
}

他们是一样的。或者也许是那样？

{
    "anyOf": [ { "type": "string" }, { "type": "null" } ]
}

还是那个？

{
    "oneOf": [ { "type": "string" }, { "type": "null" } ]
}