('edition_type', models.CharField(max_length=4)),
('edition_number', models.IntegerField(default=1)),
('language', models.CharField(max_length=4)),
('imprint', models.CharField(max_length=256)),
('publishing_date', models.DateField()),
('edition_type', models.CharField(max_length=4)),
('edition_number', models.IntegerField(default=1)),
('language', models.CharField(max_length=4)),
('imprint', models.CharField(max_length=256)),
('publishing_date', models.DateField()),