json_schema: {
      "properties": {
          "User": {
              "_id": "/User",
              "properties": {
                  "email": {
                      "_id": "/User/email",
                      "type": "string"
                  },
                  "firstName": {
                      "_id": "/User/firstName",
                      "type": "string"
                  },
                  "lastName": {
                      "_id": "/User/lastName",
                      "type": "string"
                  },
                  "password": {
                      "_id": "/User/password",
                      "type": "string"
                  }
              },
              "required": [
                  "firstName",
                  "lastName",
                  "password",
                  "email"
              ],
              "type": "object"
          },
          "emails": {
              "_id": "/emails",
              "items": {
                  "_id": "/emails/0",
                  "properties": {
                      "_id": {
                          "id": "/emails/0/id",
                          "type": "string"
                      },
                      "author": {
                          "_id": "/emails/0/author",
                          "type": "string"
                      },
                      "html": {
                          "_id": "/emails/0/html",
                          "type": "string"
                      },
                      "subject": {
                          "_id": "/emails/0/subject",
                          "type": "string"
                      }
                  },
                  "type": "object"
              },
              "type": "array"
          }
      },
      "required": [
          "User",
          "emails"
      ],
      "type": "object"
  }