.. class:: BsdDbShelf(dict, protocol=None, writeback=False, keyencoding='utf-8')
- A subclass of :class:`Shelf` which exposes :meth:`first`, :meth:`!next`,
- :meth:`previous`, :meth:`last` and :meth:`set_location` which are available
- in the third-party :mod:`bsddb` module from `pybsddb
+ A subclass of :class:`Shelf` which exposes :meth:`!first`, :meth:`!next`,
+ :meth:`!previous`, :meth:`!last` and :meth:`!set_location` methods.
+ These are available
+ in the third-party :mod:`!bsddb` module from `pybsddb
<https://www.jcea.es/programacion/pybsddb.htm>`_ but not in other database
modules. The *dict* object passed to the constructor must support those
methods. This is generally accomplished by calling one of
- :func:`bsddb.hashopen`, :func:`bsddb.btopen` or :func:`bsddb.rnopen`. The
+ :func:`!bsddb.hashopen`, :func:`!bsddb.btopen` or :func:`!bsddb.rnopen`. The
optional *protocol*, *writeback*, and *keyencoding* parameters have the same
interpretation as for the :class:`Shelf` class.