A service definition created in WSDL describes the format of system requests regardless of the run-timeimplementation.
以wsdl格式创建的服务定义描述了与运行时实现无关的系统请求格式。
2
The biggest issue with most of them is that no compiler warnings or run-time errors tell you that the transaction implementation is incorrect.
大多数陷阱最大的问题是，不会有任何编译器警告或运行时错误告诉您事务实现是不正确的。
3
Client classes can be coded to require only the abstract type, leaving the strategies and outcomes of implementation to the concrete class instances passed to them at runtime.