Services 
Use
Services are applications that provide useful functions that are frequently required for end-users, external applications or Knowledge Management components. From a technical perspective, they are extensions that are plugged into the framework. The framework provides the infrastructure for the integration of the services and the runtime environment for their execution.
Services that offer system-centric functions and are closely related to the repository framework are grouped together as framework services. Services that offer functions that are user-centric and enhance the Knowledge Management layer are categorized as application services.
Features
The repository framework distinguishes between repository services and global services.
Repository Services
These services are directly assigned to a repository manager in the configuration. They provide additional capabilities to handle the resources that are exposed by the repository manager which they are assigned to.
The repository framework instantiates an instance of a repository service for each individual configuration of the service that exists. This means that different repository managers can have their own instance of a repository service. Also, different instances of the same service can co-exist for a single repository.
Global Services
Unlike repository services, global services are independent of repositories. They normally do not need to access repositories or interact with repository managers. An essential characteristic is that they are only instantiated once at runtime. Therefore the same instance of a service is used by all components. As global services are independent of repositories, they are not explicitly assigned to repositories in the configuration.
See Also:
Global Services for the Framework
Repository Services for the Framework