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An explicit collection is defined by listing its member objects within the collection object. This is probably the most obvious way to make a collection but it is not terribly flexible. If you were to add a new object to the collection you would need not only to create the object itself, but also to alter the 'membership list' in the collection object - so you have two objects that you need to work on. Implicit collections may be a better way of dealing with collections whose membership may change with time. Explicit collections are best used for collections which have a fixed and generally unchanging membership. So, for instance, you might want to use an explicit collection for 'The Works of Shakespeare'. This collection would have a finite, unchanging number of members. (OK, so there is an outside chance that another one might be found, but...) |