This page is used when an entry in some way contains another entry. Most frequently this either means (1) the "container" is a box, and the "content" is a book which was sold separately and also appeared in that box (e.g., some of the Traveller boxed sets); or (2) the "container" reprinted a number of "contents" which were previously separate (e.g., TSR's reprints like A1-4).

Do not use this system to detail individual books in a box which were never sold seperately. Do not use this system for a new printing of the same book (which is an edition, not content).

Usually you'll mark a "main entry" as being a content of a "main entry". You might instead use an editionid as a container if different editions of an entry contained different things. You might instead use as editionid as a content if a boxed set contained a very exact edition of a book.

When in doubt, link the main entries.

A variation of this system will be used in the future for articles in magazines, anthologies, and other compilations.