Linking to local resources

[chrysn]

Just like RFC6690 has trouble providing a link from <something://explicit> to </>, current CoRAL inherits that very issue because the base is changed whenever we step into a node.

On 6690 I'd be tempted to go with rev rather than rel (if that were not deprecated), in CoRAL a workaround can be to just define a reverse term (as is common in RDF as well).

Unless we plan to do something about this (like a base-reset directive), I think it'd suffice to state that links to an unknown base URI are only possible from the base URI.

(Example point here is that in BLE, the server might have a really hard time a.k.a. have no chance to know which base URI the client sees; in the normal case client and server should usually agree on the base URI).