default:			isNumerical = true;
default:			isNumerical = true; break;
	public FuncExpr(int oc , Alist list){		a = 0;	  opCode = oc;	  argumentList = list;	  isBoolean = false;	  isString  = false;	  position = 0;	  //isNodeSet = false;	  isNumerical = false;	  switch(opCode){			case FuncName.LAST: 			isNumerical = true;break;			case FuncName.POSITION: 		isNumerical = true;break;			case FuncName.COUNT: 			isNumerical = true;break;			case FuncName.LOCAL_NAME: 		isString = true; break;			case FuncName.NAMESPACE_URI: 	isString = true; break;			case FuncName.NAME: 			isString = true; break;			case FuncName.STRING: 			isString = true; break;			case FuncName.CONCAT: 			isString = true; break;			case FuncName.STARTS_WITH:		isBoolean= true;break;			case FuncName.CONTAINS: 		isBoolean= true;break;			case FuncName.SUBSTRING_BEFORE: isString = true; break;			case FuncName.SUBSTRING_AFTER: 	isString = true; break;			case FuncName.SUBSTRING: 		isString = true; break;			case FuncName.STRING_LENGTH: 	isNumerical = true;break;			case FuncName.NORMALIZE_SPACE: 	isString = true; break;			case FuncName.TRANSLATE:	 	isString = true;break;			case FuncName.BOOLEAN: 			isBoolean =true;break;			case FuncName.NOT: 			    isBoolean =true;break;			case FuncName.TRUE: 			isBoolean = true;break;			case FuncName.FALSE: 			isBoolean = true;break;			case FuncName.LANG: 			isBoolean = true;break;			case FuncName.NUMBER:			isNumerical = true;break;			case FuncName.SUM: 			    isNumerical = true;break;			case FuncName.FLOOR: 			isNumerical = true;break;			case FuncName.CEILING: 			isNumerical = true;break;			default:			isNumerical = true;	  }	  	}