How should previousBaseline behave when an intermediate baseline is deleted?

Modifying links leads to complications if the data is restored from an archive, so we will not require any such change. Instead, add a non-normative note: Since providers may support deletion of baselines, clients must not assume that references to baselines can be resolved; like any other resource, clients must be prepared to handle 404 errors. Since baselines are normally linked into a provenance chain using the oslc_config:previousBaseline property, servers may elect to leave a stub resource (one with a minimal set of properties) behind instead of truly deleting a baseline. Servers SHOULD add the property oslc:archived=TRUE on a reduced form of a partially deleted baseline.