XML Schema xs:alternative是否在JSON Schema中可用? [英] Is XML Schema xs:alternative equivalent available in JSON Schema?

问题描述

是否可以在JSON模式中使用替代项?在XSD中，可以使用xs:alternative元素来实现.

Is it possible to use alternatives in JSON Schema? In XSD this is doable using xs:alternative element.

例如，请参见:如何在XML模式中使用替代项1.1

更新1:

这是一个示例JSON，我想使用JSON模式进行描述:

This is a sample JSON I would like to describe using JSON schema:

{
  "actions": [
    {
      "type": "basic",
      "param1": "value"
    },
    {
      "type": "extended",
      "param1": "value",
      "param2": "blah"
    }
  ]
}

要求:

• actions可以有任意数量的项目
• basic操作必须包含param1属性
• extended操作必须包含param1和param2属性

• actions may have any number of items
• basic actions must contain param1 property
• extended actions must contain param1 and param2 properties

推荐答案

Draft04以来存在类似的机制，具有更好的语义:oneOf，anyOf，allOf和not，关键字.

There is a similar mechanism since Draft04 with nicer semantics: oneOf, anyOf, allOf and not, keywords.

• oneOf:强制给定元素仅满足模式列表中的一个.
• anyOf:必须满足至少一个模式列表.
• allOf:必须满足列表中所有提供的模式.
• 不:不能满足给定的模式.

假设您正在寻找排他的替代"，这将是使用oneOf的json模式的示例:

Assuming you are looking for an exclusive "alternative", this would be an example of json-schema using oneOf:

{
    "actions" : {
        "type" : "array",
        "items" : {
            "oneOf" : [{
                    " $ref " : "#/definitions/type1 "
                }, {
                    " $ref " : "#/definitions/type2 "
                }
            ]

        }

    },
    " definitions " : {
        " type1 " : {
            " type " : " object ",
                        "properties": {
                                  "param1":{"type":"string"}
                        },
                        "required":["param1"]
        },
        " type2 " : {
            " type " : " object ",
                         "properties": {
                                  "param2":{"type":"string"},
                                  "param3":{"type":"string"}
                        },
                         "required":["param2","param3"]
        }
    }
}

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