Correct JSON Schema for an array of items of different type

I asked this same question on the JSON schema google group, and it was answered quickly. User fge asked that I post his response here:

Hello,

The current specification is draft v4, not draft v3. More specifically, the validation specification is here:

http://tools.ietf.org/html/draft-fge-json-schema-validation-00

The web site is not up to date, I don't know why... I'll submit a pull request.

With draft v4 you can use this:

{    "type": "array",    "items": {        "oneOf": [            {"first": [ "schema", "here" ] },             {"other": [ "schema": "here" ] }        ]    }  }

For instance, this is a schema for an array where items can be either strings or integers (it can be written in a more simple way though):

{    "type": "array",    "items": {        "oneOf": [            {"type": "string"},            {"type": "integer"}        ]    }}

This is the correct answer. My corrected schema now includes:

"transactions" : {    "type" : "array",    "items" : {        "oneOf" : [            {                "type" : "object",                "properties" : {                    "type" : {                        "type" : "string",                        "enum" : ["BUILD", "REASSIGN"]                    }                }            },            {               "type" : "object",               "properties" : {                 "type" : {                   "type" : "string",                   "enum" : ["BREAK"]                  }               }            }        ]    }}

I've been looking into this for quite a while too. But haven't been able to find a working solution. It works fine if you have only one schema eg.

"transactions" : {          "type" : "array",          "items" :           {            "type" : "object",            "properties" : {              "type" : {                "type" : "string",                "enum" : ["BREAK"]              },          }}

Then you just skip the array brackets, and use an object. However if you want to do what you are doing, there seems to be no solid answer. This is the only thing that I've found so far: http://the-long-dark-tech-time.blogspot.se/2012/12/using-json-schema-with-array-of-mixed.html

For anyone stuck with the draft 3 schema. There is a "Type" keyword that is equivalent to the "anyOf" in draft 4:

So you can use

{    "fooBar" : {        "type" : "array",        "items" : {            "type" : [{                    "type" : "object",                    "properties" : {                        "foo" : {                                                       "type" : "string"                        }                    }                }, {                    "type" : "object",                    "properties" : {                        "bar" : {                            "type" : "string"                        }                    }                }            ]        }    }}