Resolve relative external references

// person.json, has a relative external schema reference 'address.json'
// --------
// {
//   'type': 'object',
//   'properties': {
//     'name': {'type':'string'},
//     'addresses': {
//       'type': 'array',
//       'items': {'$ref': 'address.json'}
//     }
//   }
// }
// --------

using (StreamReader file = File.OpenText(@"c:\person.json"))
using (JsonTextReader reader = new JsonTextReader(file))
{
    JSchemaUrlResolver resolver = new JSchemaUrlResolver();

    JSchema schema = JSchema.Load(reader, new JSchemaReaderSettings
    {
        Resolver = resolver,
        // where the schema is being loaded from
        // referenced 'address.json' schema will be loaded from disk at 'c:\address.json'
        BaseUri = new Uri(@"c:\person.json")
    });

    // validate JSON
}