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+Architecture overview
+=====================
+
+Books
+-----
+
+Books are kept in the :py:class:`catalogue.models.Book` model.  Dublin Core
+metadata, read by :py:mod:`librarian.dcparser.BookInfo`, are put in the
+`extra_info` JSON field.
+
+Authors, kinds, epochs, genres are kept in :py:class:`catalogue.models.Tag`
+model with `category` field set to appriopriate value.
+
+:py:class:`catalogue.models.Tag` also contains :ref:`user-shelves`
+and :ref:`parent-relations`.
+
+
+User shelves
+------------
+
+User shelves (or tags on user's shelf) are just :py:class:`catalogue.models.Tag`
+objects with ``category='set'`` and ``user`` set to the owner. Shelves' slugs
+are generated automatically using :py:fun:`catalogue.utils.get_random_hash`.
+
+
+Parent relations
+----------------
+
+The source of parent relations is the
+:py:class:`librarian.dcparser.BookInfo.parts` metadata.
+
+Parent relations are kept primarily in the :py:attribute:`catalogue.models.Book.parent`
+and :py:attribute:`catalogue.models.Book.parent_number` fields.
+
+They're also cached as :py:class:`Tag <catalogue.models.Tag>` relations.
+Each book has its tag (with :py:attribute:`slug <catalogue.models.Book.slug>`
+starting with ``l-``).  All of book's descendants (NOT the book
+itself) have its tag attached.
+
+Arguably, this scheme has some potential for inconsistency.