c:if的用法

<c:if test="${!empty agreement}">
                                <c:forEach items="${agreement }" var="i">
                                    <tr class="gradeC">
                                        <td class="center">${i.id}</td>
                                        <td class="center">
                                            <c:if test="${'1' == i.isno}">
                                                 是
                                            </c:if>
                                            <c:if test="${'0' == i.isno}">
                                                 否
                                            </c:if>
                                        </td>

                                    </tr>
                                </c:forEach>
 </c:if>