filter 에서는 조건 사용을 못하나요?

<filter name="test_write" module="test" act="procTestWrite" confirm_msg_code="confirm_write">
    <form>
        <node target="title" required="true" />
        <node target="select_cate" />
        <node target="about_cate"  />
    </form>
    <parameter />
    <response callback_func="completeTestWrite">
        <tag name="error" />
        <tag name="message" />
        <tag name="module" />
        <tag name="act" />
    </response>
</filter>