嵌套在2个或更多字段中

Question

我正在尝试在ibatis上做这样的事情：

<isNotEmpty property="propertyA">
    <isNotEmpty property="propertyB">
        query regarding propertyA and propertyB                         
    </isNotEmpty>
    <isEmpty property="propertyB">
        query regarding propertyA ONLY!!!               
    </isNotEmpty>                   
</isNotEmpty>

<isEmpty property="propertyA">
    <isNotEmpty property="propertyB">
        query regarding propertyB ONLY!!!                               
    </isNotEmpty>
</isEmpty>

但我的代码不起作用。我怎样才能做到这一点？提前谢谢......