Create a cardtype "Namepace" with a syntax to reference a remote Wagn or a card in the remote wagn.

The semantics is that you would "mount" the remote namespace or subtree based on a specific card would now be available locally as <Namespace Cardname>+<name in other space>

Other modules could be written to make other remote resource (e.g. WikiMedia) available as "cards" and mount them as namespaces.