case SPLTreeParserTokenTypes.UNARY_MINUS:
returnExpr = new UnaryMinusExpression(exprList, validateExpr);
break;
case SPLTreeParserTokenTypes.UNARY_PLUS:
returnExpr = new UnaryPlusExpression(exprList, validateExpr);
break;
case SPLTreeParserTokenTypes.UNARY_NOT:
//Xiping 06/12/08
//returnExpr = new UnaryNotExpression(exprList, validateExpr);