Create JSON Schema with references

This sample creates a new JSchema instance manually in code and sets a reused sub-schema to be referenced from 'definitions'.
Sample
Usage
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JSchema addressSchema = new JSchema
{
    Type = JSchemaType.Object,
    Properties =
    {
        { "street", new JSchema { Type = JSchemaType.String } },
        { "city", new JSchema { Type = JSchemaType.String } },
        { "country", new JSchema { Type = JSchemaType.String } },
        { "postCode", new JSchema { Type = JSchemaType.Integer } }
    }
};

JSchema deliverySchema = new JSchema
{
    Type = JSchemaType.Object,
    Properties =
    {
        { "date", new JSchema { Type = JSchemaType.String, Format = "date-time" } },
        { "fromAddress", addressSchema },
        { "toAddress", addressSchema }
    },
    ExtensionData =
    {
        ["references"] = new JObject
        {
            ["address"] = addressSchema
        }
    }
};

string schemaJson = deliverySchema.ToString();

Console.WriteLine(schemaJson);
// {
//   "references": {
//     "address": {
//       "type": "object",
//       "properties": {
//         "street": {
//           "type": "string"
//         },
//         "city": {
//           "type": "string"
//         },
//         "country": {
//           "type": "string"
//         },
//         "postCode": {
//           "type": "integer"
//         }
//       }
//     }
//   },
//   "type": "object",
//   "properties": {
//     "date": {
//       "type": "string",
//       "format": "date-time"
//     },
//     "fromAddress": {
//       "$ref": "#/references/address"
//     },
//     "toAddress": {
//       "$ref": "#/references/address"
//     }
//   }
// }

JObject delivery = JObject.Parse(@"{
  'date': '2017-01-14T20:34:22Z',
  'fromAddress': {'street':'33 Smith Street','City':'Wellington','Country':'NZ','postCode':6011},
  'toAddress': {'street':'2 Hurman Street','City':'Wellington','Country':'NZ','postCode':6005}
}");

bool valid = delivery.IsValid(deliverySchema);

Console.WriteLine(valid);
// true