{
   "$defs": {
      "C1": {
         "additionalProperties": false,
         "description": "",
         "properties": {
            "sa": {
               "type": "string"
            },
            "sb": {
               "type": "integer"
            }
         },
         "required": [],
         "title": "C1",
         "type": "object"
      },
      "C2": {
         "additionalProperties": false,
         "description": "",
         "properties": {
            "sb": {
               "type": "integer"
            }
         },
         "required": [],
         "title": "C2",
         "type": "object"
      }
   },
   "$id": "http://example.org/tests/issue177",
   "$schema": "http://json-schema.org/draft-07/schema#",
   "additionalProperties": true,
   "properties": {
      "sa": {
         "type": "string"
      },
      "sb": {
         "type": "integer"
      }
   },
   "required": [],
   "title": "issue177",
   "type": "object"
}
