The library is a catalogue, not a reading list. It records the texts that have made the system what it is — works to which its arguments owe something, references that recur in its writing, sources held close enough to be worth listing by name.
It is not Knowledge — the atomic understandings extracted from reading. It is not a reading queue — the personal record of what has been read or is waiting to be. It is the bibliographic substrate that those other things attach to: the canonical record of works and authors, independent of any particular use being made of them.
The shape borrows pragmatically from library science: each entry is a Work(the abstract intellectual creation — Plato’s Republic) which may have one or more Editions (a particular translator, publisher, year). Authors and other contributors are first-class — one person writes many works, one work involves many people.