// 规则： Robert和John是男性
public static Expression GetMaleExpression()
{
Expression robert = new TerminalExpression("Robert");
Expression john = new TerminalExpression("John");
return(new OrExpression(robert, john));
}
// 规则：Julie是一个已婚的女性
public static Expression GetMarriedWomanExpression()
{
Expression julie = new TerminalExpression("Julie");
Expression married = new TerminalExpression("Married");
return(new AndExpression(julie, married));
}
