src/test/resources/draft7/urn/issue665_external_urn_ref.json

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "required": [
    "myData"
  ],
  "properties": {
    "myData": {
      "$ref": "urn:data"
    }
  }
}