Originally posted by: TarunB
Explicit is easy enough to understand, i.e. you have a group which consists of components that are clearly (explictly) distinguishable so that you know where each one begins and ends and how it is separated from the next component.
Implicit groups still have a defined format but have no defined delimiter or fixed format. An implicit group will need to have its components defined in another way so as to be distinguishable, such as by using an initiator, terminator, identifier etc.
The most common example is the File group consisting of multiple Record groups. The File group is implicit because you don't know the final size or how many Records it will contain. The Record group is explicit because as a component of File one instance of Record must be distinguishable from the next.
Probably not the easiest subject to describe though!
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