@Override
	public boolean isValidObject(){
		if(lines.size() == 3){
			String begin = lines.get(0);
			String middle = lines.get(1);
			String end =lines.get(2);
			
			return    (begin.startsWith(SECTION_SEP) && end.startsWith(SECTION_SEP) && isValidSectionNumber(middle))
					|| (begin.startsWith(SUBSECTION_SEP) && end.startsWith(SUBSECTION_SEP) && isValidSectionNumber(middle))
					|| (begin.startsWith(SUBSECTION_SEP2) && end.startsWith(SUBSECTION_SEP2) && isValidSectionNumber(middle));
			
		}
		return false;		
	}