code: protected boolean semanticallyEquivalent(BioPAXElement element)
  	{
  		if (!(element instanceof sequenceSite))
  		{
  			return false;
  		}
  
  		final sequenceSite that = (sequenceSite) element;
  		return
  			(SEQUENCE_POSITION == that.getSEQUENCE_POSITION()) &&
  				(POSITION_STATUS != null ?
  					POSITION_STATUS.equals(that.getPOSITION_STATUS()) :
  					that.getPOSITION_STATUS() == null);
  	}
docs: --------------------- Interface BioPAXElement ---------------------