子类型

• A child of
  的子类型必须添加一个
• Or you could extend
  子类型扩展
• Class with the specified identity reference , access control type , and child type
  使用指定的标识引用、访问控制类型和子类型来初始化
• Its hierarchy reveals that there are not many general purpose subtype interfaces , just
  其层次结构表明它的通用子类型接口并不多，只有
• Type of terminal
  端子类型
• Chart sub - type
  图表子类型
• Because interfaces are inherited , any subtypes of these types will also be included
  因为接口是继承的，所以这些类型的所有子类型都包括在内了。
• Different subtypes do not conflict with each other or with the nonsubtyped parent type
  不同的子类型之间以及与非子类型化的父类型之间都不会发生冲突。
• Each node can contain some identifying data , plus a set of subnodes of a specific child type
  每个节点可以包含一些标识数据，以及一组特定子类型的子节点。
• Each type of chart has two or more subtypes that you can click to customize its standard features
  每一图表类型都有两种或多种子类型，单击即可自定义标准特性。