CDC common data class 公用数据类
A base class is great for defining common functionality, but you must make sure that each data element defined is truly necessary.
基类可以很好地定义常见功能，但是您必须确保所定义的每个数据元素都是真正需要的。
A common (canonical) UML class model of the main data items (the business entities) and their relationships.
主要数据项(业务实体)及其关系的通用(规范的)uml类模型。
All the custom JMS data bindings have a common super class, called AbstractJMSDataBindingImpl, which implements some common functionality; for example, methods for exception handling.
所有自定义JMS数据绑定都具有一个称为AbstractJMSDataBindingImpl的公共超类，这个类实现了一些公共的功能，比如，进行异常处理的方法。
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