{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "definitions": {
    "dog": {
      "allOf": [
        {
          "$ref": "#/definitions/xs:positiveInteger"
        },
        {
          "minimum": 5,
          "exclusiveMinimum": false
        }
      ]
    },
    "xs:positiveInteger": {
      "type": "integer",
      "minimum": 0,
      "exclusiveMinimum": true
    }
  }
}