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Expert Aspects of Resources 
The following expert functions are available for resources:
· Versioning
The framework implements a versioning mechanism that allows all previous versions of a resource to be stored and retrieved.
· Type Handling
Resources can be converted to business objects with a casting mechanism. Conversion is useful for applications that need to apply their business logic to resources in the framework.
When business objects from a backend system are integrated in the framework as resources, they expose the interfaces common to all resources, but not the data and methods of the original business objects. To be able to access the methods encapsulated by the business objects, applications can use the casting mechanism that converts resources into business objects. Once the conversion has taken place, the business objects expose their original methods and data within the framework, allowing applications to make use of them as required.
See also:
sdn.sap.com/sdn/developersguide.sdn ® NDG SAP NetWeaver 7.0 Edition ® Developing Applications in line with IT Scenarios ® Enterprise Knowledge Management ® Knowledge Management Articles ® Expert Aspects of Resources.