@abc.abstractmethod<EOL><INDENT>def get_resource_bin_session(self):<DEDENT>
return<EOL>
Gets the session for retrieving resource to bin mappings.

        :return: a ``ResourceBinSession``
        :rtype: ``osid.resource.ResourceBinSession``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_resource_bin()`` is ``false``

        *compliance: optional -- This method must be implemented if
        ``supports_resource_bin()`` is ``true``.*