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Any URN is different from a hash in that it isn't computable. It must be known.

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http://lj.rossia.org/users/imz/ 2012-09-26 18:28:31 +00:00 committed by admin
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doc/todo/wishlist:_spec.remotes_for_other_peer_network_data_stores___40__gnunet__44___freenet__41__.mdwn
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@ -22,4 +22,5 @@ For example:
* Similarly, a backend for the hashes used in **BitTorrent** and **magnet links** could be used. If we want a trackerless mode, then probably it's a similar case for a "global"/built-in special remote that needs no local setup in each repo. Using a selected tracker would mean setting up a special remote in our repo.
* **Git** itself can be viwed as place to look for the content. There could be a corresponding backend and a builtin special remote (needing no extra setup) to look for the content among the objects stored in the local Git repo. (What if we have a copy of a file that we've put under the control of git-annex in a previous Git commit? We could get it from the object store of Git.)
* **Venti**, [[**Tahoe-LAFS**|todo/tahoe lfs for reals]] would need a backend for their hashes, and a specially setup special remote in each repo where we'd like to use them--because these are not "global" system, we must setup the path to the instance of the filesystem we'd like to use.
* probably, there must be other interesting cases of this kind.... (I'm also thinking about using somethng like a bibliogrphic information as a key, but then it wouldn't guarantee identical files: the same paper can be stored in different formats, etc. Cf. <http://en.wikipedia.org/wiki/Uniform_resource_name#Examples>, via <http://it.slashdot.org/comments.pl?sid=3032489&cid=40907233>.)
* probably, there must be other interesting cases of this kind...
* (I'm also thinking about using somethng like a **bibliographic information** as a key, but then it wouldn't guarantee identical files: the same paper can be stored in different formats, etc. Cf. [**URNs**](http://en.wikipedia.org/wiki/Uniform_resource_name#Examples), via <http://it.slashdot.org/comments.pl?sid=3032489&cid=40907233>. Also, an URN like bibliographic information can't be computed from the file, it will have to be entered manually or obtained from another directory of URNs.)