def __init__(self, base_class=BaseHeader, default_class=UnstructuredHeader,
                       use_default_map=True):
        self.registry = {}
        self.base_class = base_class
        self.default_class = default_class
        if use_default_map:
            self.registry.update(_default_header_map)
Create a SimpleDB domain.
dataset/ETHPy150Open OpenCobolIDE/OpenCobolIDE/open_cobol_ide/extlibs/future/backports/email/headerregistry.py/HeaderRegistry.__init__--crossover with--dataset/ETHPy150Open darcyliu/storyboard/boto/sdb/connection.py/SDBConnection.create_domain