json/remotes/urn-ref-string.json - third_party/github.com/python-jsonschema/jsonschema - Git at Google

 {
     "$id": "urn:uuid:feebdaed-ffff-0000-ffff-0000deadbeef",
     "$defs": {"bar": {"type": "string"}},
     "$ref": "#/$defs/bar"
 }
	{
	"$id": "urn:uuid:feebdaed-ffff-0000-ffff-0000deadbeef",
	"$defs": {"bar": {"type": "string"}},
	"$ref": "#/$defs/bar"
	}