The file that defines the database models of a plugin.
Every plugin usually has such a file, and Django imports them automatically during startup. See Introduction to plugins.
A file that defines the data views (the "user interface") provided by a plugin.
By convention this file, if it exists, is to be imported into the
models.py file using a line
from .ui import * at the bottom of that
This is the directory where Lino expects certain subdirs.
These are obsolete synonyms for
An input template used by