By name linking

Previously, objects such as nodes in a message flow, or an execution group, were identified by a system-generated identifier called a universally unique identifier (uuid). When an object was removed, renamed or deleted, the reference to the object was lost.

In WebSphere Message Broker, users identify objects using a combination of a namespace and a name, referred to as a fully qualified name. The use of fully qualified names makes it easy to identify and locate objects, and to correct broken references. For example, if you rename an object, all references to that object are broken. If you substitute another object with the same name, all the broken references are corrected. This concept, called by name linking, is particularly important when you are working in a team environment. It means that you can share files in a repository and concurrently modify, add, and delete objects in your message flow application. When you integrate the various parts of the application, you can detect and resolve broken references to objects that have been moved, renamed or deleted.

Related concepts
Namespaces in the message model
Related reference
Rules for naming workspace objects