So when all is said an done, post 303 redirection imbroglio, the moral
of the story *seems* to read as follows:
When you make a hypermedia based Ontology for deployment on an HTTP
network (intranet, extranet, World Wide Web) do include a relation that
associates it with the Properties and Classes that it describes.
Commonly used predicate for this is: rdfs:isDefinedBy  .
When you create hypermedia based structured data for deployment on an
HTTP network (intranet, extranet, World Wide Web) do include a relation
that associates each Subject/Entity (or Data Item) with its
container/host document. A suitable predicate for this is:
wdrs:describedBy  .
At the current time, most ontologies deployed on the Web do not include
rdfs:isDefinedBy triples. The same applies to descriptor documents (RDF
included) currently deployed on the Web re. wdrs:isDescribeBy.
As a best practice, common use of these predicates would increase
navigability, link density, and overall cohesiveness of the burgeoning
Web of Linked Data. It would truly demonstrate practicing what we
preach, dog-food style!