Changed all status to start with Uppercase letters, made 3 properties required. Changed all the status to start with Uppercase letters because they are publicly visible. Also changed required=True to False for created_by, modified_by property to allow site admin to create and modify tasks. Also changed required=True to False for history to allow history not to be written until the task is published.

from query import *
from subqueries import *
from where import AND, OR
from datastructures import EmptyResultSet

__all__ = ['Query', 'AND', 'OR', 'EmptyResultSet']