String nextControlWord() throws StorageReaderException {
		try {
			String line = file.readLine();
			while(line != null && (isCommentString(line) || !isControlWord(line))) {
				line = file.readLine();
			}
			if(isEndOfBlock(line)) {
				throw new EndOfBlockException(fileName);
			}
			return line;
		} catch(IOException e) {
			throw new StorageReaderException(e);
		}
	}