code: public String getPositionInString(ModificationFeature mf)
  	{
  		Set vals = SITE_ACC.getValueFromBean(mf);
  
  		if (!vals.isEmpty())
  		{
  			int x = ((Integer) vals.iterator().next());
  			if (x > 0) return "@" + x;
  		}
  
  		vals = INTERVAL_BEGIN_ACC.getValueFromBean(mf);
  
  		if (!vals.isEmpty())
  		{
  			int begin = ((Integer) vals.iterator().next());
  
  			vals = INTERVAL_END_ACC.getValueFromBean(mf);
  
  			if (!vals.isEmpty())
  			{
  				int end = ((Integer) vals.iterator().next());
  
  				if (begin > 0 && end > 0 && begin <= end)
  				{
  					if (begin == end) return "@"  + begin;
  					else return "@" + "[" + begin + "-" + end + "]";
  				}
  			}
  		}
  
  		return "";
  	}
docs: Gets the position of the modification feature as a String.
  @param mf modification feature
  @return location