if (e.isBoolean()) return e.evalBoolean(vn);
	public boolean evalBoolean(VTDNav vn) {		boolean a = false;		vn.push2();		//record stack size		int size = vn.contextStack2.size;	    try{				a = (evalNodeSet(vn) != -1);		}catch (Exception e){		}		//rewind stack		vn.contextStack2.size = size;		reset(vn);		vn.pop2();		return a;	}