When writing RDF (in N3 normaly) by hand, the # methd is very easy, and works well. You naturally write in files of manageble size which are easily delivered over the net. The thing after the # is the local identifier in the file,
and you can add also som identifiers for other related things which are naturally described in the same file.

When a large set of identifiers are generated automaticaly, then the 303 method may make sense, but the # method will work too, even if every uri ends “#it”, which looks odd. It is faster from the client’s poiunt of view.

For example, the tabulator, which, like many things, looks up the ontology for each predicate or class term it comes across, has to look up every single Dublin Cote term (which has no #) like dc:title separately just to find each redirects to the same ontology file.

- Berlin the city (the thing itself; the concept)

- A document describing Berlin

Only cognitive scientists or cultural historians would bother to divide the first one into two distinct entities. I’m not one of those, and therefore don’t bother to make the distinction, and believe that the way I’ve presented it is perfectly clear for the intended target audience.

If you have a good term for “those URIs that do not identify documents but other things, like cities or people or software projects“, a term that is understandable to non-experts, then please share. The best I could come up with was “concept URI”. And if you offer “entity URI” or “non-information resource URI“, then I shall personally lock you up in an ivory tower.