from core.xml.xmlwriter0 import CoreDocumentWriter0
from core.xml.xmlwriter1 import CoreDocumentWriter1


def core_document_writer(session, version):
    if version == '0.0':
        doc = CoreDocumentWriter0(session)
    elif version == '1.0':
        doc = CoreDocumentWriter1(session)
    else:
        raise ValueError('unsupported document version: %s' % version)
    return doc