You can define the crs (srsName) for a geo: link which effectively allows you to do that. See the registry in the spec.
roBman On Mon, 2011-10-10 at 21:26 +0200, Christoph Päper wrote: > Tantek Çelik: > > > See RFC 5870[1] for a proposed standard geo URI scheme for "geo:" > > hyperlinks. > > I wonder whether this scheme, someday, will be extended to include a domain > part, e.g. geo:13.4125,103.8667@mars, or whether we’ll rather get a ‘astro:’ > scheme.