{
  "$id": "http://example.com/combining-not",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "description": "Test schema with a not",
  "type": "object",
  "required": [ "not_a_string" ],
  "properties": {
    "not_a_string": {
      "not": { "type": "string" }
    }
  }
}