@abc.abstractmethod<EOL><INDENT>def get_authorization_session_for_vault(self, vault_id, proxy):<DEDENT>
return<EOL>
Gets an ``AuthorizationSession`` which is responsible for performing authorization checks for the given vault.

        :param vault_id: the ``Id`` of the vault
        :type vault_id: ``osid.id.Id``
        :param proxy: a proxy
        :type proxy: ``osid.proxy.Proxy``
        :return: ``an _authorization_session``
        :rtype: ``osid.authorization.AuthorizationSession``
        :raise: ``NotFound`` -- ``vault_id`` not found
        :raise: ``NullArgument`` -- ``vault_id`` or ``proxy`` is ``null``
        :raise: ``OperationFailed`` -- ``unable to complete request``
        :raise: ``Unimplemented`` -- ``supports_authorization()`` or ``supports_visible_federation()`` is ``false``

        *compliance: optional -- This method must be implemented if
        ``supports_authorization()`` and
        ``supports_visible_federation()`` are ``true``.*