@property<EOL><INDENT>def designation(self):<DEDENT>
return self._designation<EOL>
Designation of the Amira file defined in the first row

        Designations consist of some or all of the following data:

        *    filetype e.g. ``AmiraMesh`` or ``HyperSurface``

        *    dimensions e.g. ``3D``

        *    format e.g. ``BINARY-LITTLE-ENDIAN``

        *    version e.g. ``2.1``

        *    extra format e.g. ``<hxsurface>``