@abc.abstractmethod<EOL><INDENT>def string_to_cardinal(self, str_):<DEDENT>
return<EOL>
Parses a cardinal string.

        :param str: a cardinal string
        :type str: ``string``
        :return: the cardinal value
        :rtype: ``cardinal``
        :raise: ``InvalidArgument`` -- ``str`` not of ``get_numeric_format_type()``
        :raise: ``NullArgument`` -- ``str`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*