X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/aae232dcf008ab39db553bc1b20573fa00e3b191..e466cef774f05a0c2fd99df7b8e714d0da2b9773:/doc/architecture.rst

diff --git a/doc/architecture.rst b/doc/architecture.rst
index db5b6989d..d1985e482 100644
--- a/doc/architecture.rst
+++ b/doc/architecture.rst
@@ -16,7 +16,7 @@ What are ``Tags`` used for?
 ---------------------------
 
 Each ``Tag`` objects has a ``category`` field specyfying its meaning.
-The categories are enumerated in :py:const:`catalogue.models.TAG_CATEGORIES`.
+The categories are enumerated in :py:const:`catalogue.models.tag.TAG_CATEGORIES`.
 
 Tags are used for:
 
@@ -27,7 +27,6 @@ Tags are used for:
 * User shelves. A User can put a ``Book`` on a shelf and add some labels
   by adding a number of ``set`` tags to it. A book put on a shelf without
   any labels has a Tag with an empty name.
-* Denoting :ref:`ancestor-descendant-relations` using ``book`` tags. 
 
 
 .. _ancestor-descendant-relations:
@@ -44,22 +43,6 @@ the ``dc:relation.hasPart`` metadata field, exposed by
 and the order of children of one parent is expressed with the child
 book's ``parent`` and ``parent_number`` fields.
 
-But aside from that, Tags are used for managing those relationships, too.
-
-Every ``Book`` has a matching `l-tag`. It's a ``Tag`` of category
-``book`` and matching slug with an added 'l-' prefix (the prefix
-is superfluous and we should remove it as some point, as it was only
-needed when tag slugs had to be unique).
-
-The `l-tag` of a ``Book`` is used on:
-
-* all of the book's fragments,
-* all of the book's descendants,
-* all of the book's descendants' fragments.
-
-This is used for:
-
-* finding fragments of a given theme in books with a given user label,
-* on a filtered book list (i.e., author's page), for eliminating
-  descendants, if an ancestor is already on the list,
-* when calculating tag book counts, for eliminating descendants as above,
+Additionally, every ``Book`` has a many-to-many relationship `ancestor`,
+onnecting it to all its ancestors, with reverse relationship called
+`descendant`.  This relationship is rebuilt after a `Book` is published.