A subscriber (but not a publisher) can specify a topic name that contains wildcard characters, which creates a single subscription to multiple topics, such as a branch in a topic hierarchy.
A repository can branch into multiple streams, which are distinguished by name.
资源库可以分支成多条流，这些流用名称加以区别。
3
Thread of control: Tells if the operations in a transaction need to be serialized in the process, or if multiple threads in a process can participate in the transaction branch.
Thread of control：告诉事务中的操作是否需要在流程中序列化，或者流程中的多个线程是否可以参与事务分支。