def get_resource_demographic_proxy_manager(self):
if proxy is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the ``ResourceDemographicProxyManager``.

        return:
                (osid.resource.demographic.ResourceDemographicProxyManag
                er) - a ``ResourceDemographicProxyManager``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_resource_demographic()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_resource_demographic()`` is ``true``.*