'Sets a bucket\'s default ACL to an XML string.
:type acl_str: string
:param acl_str: A string containing the ACL XML.
:type headers: dict
:param headers: Additional headers to set during the request.'

def set_def_xml_acl(self, acl_str, headers=None):

    return self.set_xml_acl(acl_str, '', headers, query_args=DEF_OBJ_ACL)
