示例 XML 代码
清单 1 给出一个示例 XML 文件，它代表一个资源（或用户）结构。下面列出示例 XML 代码中的几个属性：
Class：Java 类的名称
Extends：父 Java 类的名称
Abstract：表示在 Java 术语中这个类是否是抽象的
TestReady：表示代码生成器是否应该为这个类生成单元测试
Field name：字段的 Java 变量名
Field type：字段使用的 Java 类型
Field label：用户界面上特定字段使用的标签
Field min and max：字符串或数字值的最小和最大长度
Field default：在创建对象时，应用于一个字段的默认值
Field composite：表示字段是引用还是复合的关系
Field valid types：表示抽象对象数组中可以包含的有效类型
Field mandatory：表示在创建对象时这个字段是否是强制的
Field readable：表示用户是否可以读取这个字段
继承的字段覆盖
清单 1. 代表资源（或用户）结构的示例代码
<?xml version="1.0"?>
<object
class="sample.Resource"
abstract="false"
extends="sample.BaseObject"
testready="false"
documentation="A resource represents a user of the system.">
<rule
type="create"
documentation="To create a resource,
the user must have the administrator
security rights" />
<rule
type="update"
documentation="A resource has the right to modify
itself. Only administrators have the right to modify
resources otherwise." />
<rule
type="delete"
documentation="Administrators have the right
to delete a resouce." />
<field
name="active"
label="Active"
type="java.lang.Boolean"
default="true" />
<field
name="calendar"
label="Calendar"
type="sample.WorkCalendar"
composite="false" />
<field
name="contactGroupAssignments"
type="sample.ContactGroupAssignment[]"
composite="true">
<valid-type
class="sample.ContactGroupAssignment" />
</field>
<field
name="name"
label="Full Name"
type="java.lang.String"
mandatory="true"
max="35" />
<field
name="password"
label="Password"
type="java.lang.String"
min="3"
max="16"
readable="false" />
<!-- BaseObject -->
<inherited
name="parent"
mandatory="true">
<valid-type class="sample.ResourceFolder" />
<invalid-type class="sample.Project" />
</inherited>
</object>
<object
class="sample.Resource"
abstract="false"
extends="sample.BaseObject"
testready="false"
documentation="A resource represents a user of the system.">
<rule
type="create"
documentation="To create a resource,
the user must have the administrator
security rights" />
<rule
type="update"
documentation="A resource has the right to modify
itself. Only administrators have the right to modify
resources otherwise." />
<rule
type="delete"
documentation="Administrators have the right
to delete a resouce." />
<field
name="active"
label="Active"
type="java.lang.Boolean"
default="true" />
<field
name="calendar"
label="Calendar"
type="sample.WorkCalendar"
composite="false" />
<field
name="contactGroupAssignments"
type="sample.ContactGroupAssignment[]"
composite="true">
<valid-type
class="sample.ContactGroupAssignment" />
</field>
<field
name="name"
label="Full Name"
type="java.lang.String"
mandatory="true"
max="35" />
<field
name="password"
label="Password"
type="java.lang.String"
min="3"
max="16"
readable="false" />
<!-- BaseObject -->
<inherited
name="parent"
mandatory="true">
<valid-type class="sample.ResourceFolder" />
<invalid-type class="sample.Project" />
</inherited>
</object>
