#
from librarian import ValidationError, NoDublinCore, ParseError, NoProvider
from librarian import RDFNS, IOFile
#
from librarian import ValidationError, NoDublinCore, ParseError, NoProvider
from librarian import RDFNS, IOFile
def as_cover(self, cover_class=None, *args, **kwargs):
if cover_class is None:
def as_cover(self, cover_class=None, *args, **kwargs):
if cover_class is None: