| http://www.w3.org/ns/prov#value | - C++ does not have that restriction and is probably why it doesn???t have a separate language construct for interfaces, in contrast to languages such as Java, Delphi and C# that all have a single-inheritance model.This little history lesson should give us a clue of how we can avoid the IUnknown methods of normal interfaces ??? we can simply declare and implement a pure abstract class instead.For in
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