docs: private JsonSimpleConfig getConfigFile(String oid) {
  		if (oid == null) {
  			return null;
  		}
  
  		// Try the cache first
  		JsonSimpleConfig configFile = deCacheConfig(oid);
  		if (configFile != null) {
  			return configFile;
  		}
  		// Or evaluate afresh
  		try {
  			DigitalObject object = storage.getObject(oid);
  			Payload payload = object.getPayload(object.getSourceId());
  			log.debug("First time parsing config file: '{}'", oid);
  			configFile = new JsonSimpleConfig(payload.open());
  			payload.close();
  			cacheConfig(oid, configFile);
  			return configFile;
  		} catch (IOException ex) {
  			log.error("Rules file could not be parsed! '{}'", oid, ex);
  			return null;
  		} catch (StorageException ex) {
  			log.error("Rules file could not be retrieved! '{}'", oid, ex);
  			return null;
  		}
  	}