var Validator = require('jsonschema').Validator;
  var v = new Validator();

  // Address, to be embedded on Person
  var addressSchema = {
    id: "/SimpleAddress",
    type: "object",
    properties: {
      lines: {
        type: "array",
        items: {type: "string"}
      },
      zip: {type: "string"},
      city: {type: "string"},
      country: {type: "string"}
    },
    required: ["country"]
  };

  // Person
  var schema = {
    id: "/SimplePerson",
    type: "object",
    properties: {
      name: {type: "string"},
      address: {$ref: "/SimpleAddress"},
      votes: {type: "integer", "minimum": 1}
    }
  };

  var p = {
    name: "Barack Obama",
    address: {
      lines: [ "1600 Pennsylvania Avenue Northwest" ],
      zip: "DC 20500",
      city: "Washington",
      country: "USA"
    },
    votes: 5
  };

  v.addSchema(addressSchema, '/SimpleAddress');
  var result = v.validate(p, schema);
  console.log("Validation result:", result);