284 |
{\em do} exist, but mostly still only in research stage: for example, |
{\em do} exist, but mostly still only in research stage: for example, |
285 |
the Xanadu hypermedia model\cite{lukka02guids,ted-xanalogical-structure-needed}, |
the Xanadu hypermedia model\cite{lukka02guids,ted-xanalogical-structure-needed}, |
286 |
Open Hypermedia systems\cite{davis92openhypermedia}, |
Open Hypermedia systems\cite{davis92openhypermedia}, |
287 |
URN (Uniform Resource Name)\cite{rfc1737} and |
URN (Uniform Resource Name)\cite{rfc1737}, and |
288 |
URN-5\cite{fallenstein02urn5}. |
URN-5\cite{fallenstein02urn5}. |
289 |
% and additionally, the recently opened |
% and additionally, the recently opened |
290 |
% informal URN-5 namespace\cite{fallenstein02urn5} is |
% informal URN-5 namespace\cite{fallenstein02urn5} is |