fcbb435a_ofessional_Growth__Leadership___Description
[Title] Service Contract Inheritance with proxy chaining [Category] Contracts [Last Updated] 9/7/2006 [Description] 
Even after reworking the imported definitions of a contract hierarchy, you still have a single proxy class. You can however have the client use a hierarchy of proxies that provided an is-a relationship between the proxies, yielding a much smoother programming model. The solution demonstrates this technique we call proxy-chaining.
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