You can use applications, libraries, and integration projects to organize your resources.
You can use applications, libraries, and integration projects to build your solution. An application is a container for everything that you need for your solution. A library contains a set of resources that you might want to reuse for other solutions. You can refer to one or more libraries from an application. You can deploy your solution by dragging the appropriate resources onto an integration server, or by adding them to a BAR file.
Message flow projects have been replaced by integration projects. When you import resources from WebSphere® Message Broker Version 7.0, message flow projects are converted automatically to integration projects. You might want to convert your integration projects to applications or libraries, depending on the way in which you intend to use these resources.