Field(DCNS('subject.period'), 'epochs', salias='epoch', multiple=True),
Field(DCNS('subject.type'), 'kinds', salias='kind', multiple=True),
Field(DCNS('subject.genre'), 'genres', salias='genre', multiple=True, required=False),
+ Field(DCNS('subject.style'), 'styles', salias='style', multiple=True, required=False),
Field(DCNS('format.dimensions'), 'dimensions', required=False),
Field(DCNS('format.checksum.sha1'), 'sha1', required=True),