Looks good to me.
Once this is implemented, it would be appropriate to enhance the
http://mapserver.org/ogc/wcs_server.html documentation pages.
> Dear devs,
> I'd like to propose RFC 120: "INSPIRE download service support for WCS
> 2.0". The RFC is already available in the online documentation 
> The implementation is done in my fork .
> I'd love to see this incorporated with 7.2, if possible.
>  http://mapserver.org/development/rfc/ms-rfc-120.html
>  https://github.com/constantinius/mapserver/tree/wcs-inspire-dl
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