- (NJMapping *)objectForKeyedSubscript:(NSString *)name;
- (NJMapping *)objectAtIndexedSubscript:(NSUInteger)idx;
+- (void)addMappingWithContentsOfURL:(NSURL *)url;
- (void)activateMapping:(NJMapping *)mapping;
- (void)activateMappingForProcess:(NSString *)processName;
- (void)save;