anchor.diff:  *   `version` the schema version;
   *   `definition` the schema definition.
   
  -===== `GET /{subject}/{format}`
  +`GET /{subject}/{format}`
   
   Retrieve a list of existing schema by its subject and format.
   
  
positive.code: 
  The Schema Registry Server API consists of the following operations:
  
  ===== `POST /`
  
  Register a new schema.
  
  
negative.code: *   `version` the schema version;
  *   `definition` the schema definition.
  
  `GET /schemas/{id}`
  
  Retrieve an existing schema by its id.
  
  