class Bookmark(MetaUserEntityType):

    """define an entity type, used to build the application schema"""

    title = String(required=True, maxsize=128)

    path  = String(maxsize=512, required=True,

                   description=_("relative url of the bookmarked page"))

                                    description=_("users using this bookmark"))

class bookmarked_by(MetaUserRelationType):

    permissions = {'read':   ('managers', 'users', 'guests',),

                   # test user in users group to avoid granting permission to anonymous user

                   'add':    ('managers', RRQLExpression('O identity U, U in_group G, G name "users"')),

                   'delete': ('managers', RRQLExpression('O identity U, U in_group G, G name "users"')),

                   }