Why do the subclasses not appear in the schema?
为何模式中没有子类？
Now let's examine the specific Buffer subclasses.
现在让我们研究一些具体的buffer子类。
All SimpleNode subclasses inherit useful behavior.
所有simplenode子类都继承了有用的行为。
This allows subclasses to only override methods as needed.
这允许子类根据需要仅覆盖一些方法。
Classes now have constructor, superclass, and subclasses properties.
类现在有了constructor、superclass和subclasses属性。
In programming languages, this capability is provided by subclasses.
在编程语言中，通过子类提供这一能力。
However, the API docs don't show any concrete subclasses of IndexReader.
不管怎样，API文档没有提到任何IndexReader的具体子类。
They can also be thought of as functions mapping classes to new subclasses.
它们也可以被认为是将类映射到新子类的函数。
Also the second query doesn't need to include properties in other subclasses.
第二个查询中不需要包含其他子类中的属性。
The self keyword points to the containing class and is unaware of subclasses.
self关键字指向的是包含类，且不会意识到子类。
Mixins can be viewed as functions mapping existing classes to new subclasses.
mixin可被视为将现有类映射成新子类的函数。
Again the second query doesn't need to include properties in other subclasses.
同样的，第二个查询不需要包含其他子类的属性。
So, in your situation: your application exception classes are subclasses of RuntimeException.
因此，对于您的情况：您的应用程序异常类是RuntimeException的子类。
For the ReadablePartial subclasses, you need to jump through one extra hoop, as shown in Listing 9.
对于readablepartial子类，您还需要经过额外一步，如清单9所示。
Without being asked, nose will always detect subclasses of unittest.TestCase and use them as tests.
无须特别指定，nose总会检测 unittest.TestCase 的子类并作为测试使用它们。
One is that when you modify a class you have to modify its table and the table of any of its subclasses.
一个是当修改类时，必须修改它的表和它所有子类的表。
The subclasses for other specific parameter types (boolean, float, String, and so on) are very similar.
其他特定形参类型（boolean、float、String ，等等）的子类与此十分相似。
Qualified subclass name: name subclasses to communicate the similarities and differences with a superclass.
子类名称要合格：对子类的命名会表述出其与超类之间的相似和差异之处。
It enables Axis 1.4 to generate errors as subclasses of AxisFault, and these are caught when an error occurs.
它使Axis 1.4能够将错误生成为AxisFault的子类，当发生错误时将捕获到这些子类。
You certainly can provide optimized implementations of these methods in your subclasses, but you don't have to.
当然可以在子类中提供这些方法的优化实现，但是不是必须这么做。
Rather than create subclasses for all the combinations of possible roles, a class is created for each individual role.
它不是为所有的可能角色组合创建子类，而是为每个单独的角色创建一个类。
Bindings to complex Swing components (such as JTable, JList and JComboBox) are now handled by custom Binding subclasses.
对复杂Swing组件(例如JTable、JList和JComboBox)的绑定现在由定制的Binding子类处理。
My experience is that you should always strive to make accessors protected, so only subclasses can access the attributes.
我的经验是应该总是使读写方法受保护，所以只有子类可以访问其属性。
You can further break down the above asset classes into subclasses, which also have different risks and potential returns.
你可以更进一步将上述的资产分解为子类，每种也都具有不同的风险和潜在收益。
Accessors reduce the risk of the fragile base class problem where changes in a superclass ripple throughout its subclasses.
读写方法减少了超类中的更改影响到其子类的这种脆弱的基类问题所带来的风险。
You would expect to see that the InProgress annotation is carried through to subclasses — that it's inherited — but it isn't.
您本来希望看到InProgress注释被带到子类中——因为这是继承的——但情况并非如此。
Aggregating allows any number of extensions to be added, without the need for defining all possible combinations of subclasses.
聚合允许添加任意数量的扩展，而无需定义子类的所有可能的组合。
Here is a simple example of normal inheritance. We define a Noble base class, with subclasses such as Prince, Duke, Baron, etc.
这里有一个普通的继承的简单例子，我们定义了一个Noble基类，它有子类Prince,Duke,Baron等等。
If you have more than three, or more than seven subclasses of a single exception superclass, my bet is that something is wrong.
如果有三层以上，或者在一个异常超类中子类的个数超过了七个，那我打赌一定有什么地方出错了。
WLM allows you to assign workloads with different response time requirements to different service classes and service subclasses.
WLM允许您将具有不同响应时间需求的工作负载分配给不同的服务类和服务子类。
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