[okfn-help] Pairtree's treatment of Object Identifiers / URIs

[William Waites]

Just to point out, in case it is interesting or useful. The
pairtree directory hierarchy uses partial URIs as keys for
the objects. By default they are in the urn:uuid: namespace.

The pairtree implementation allows you to change this but
only once URI prefix per filesystem hierarchy.

So how do you store arbitrary URIs in a pairtree? Have a
look at the uuid() function in [1] which is used by the pairtree
back-end [2] in ordf. It basically normalises any identifier into
the urn:uuid: namespace.

Because this is a one-way operation, the original identifier
is stored in the object's "identifier.txt" stream/attribute

Would there be any benefit to pushing this behaviour further
down the stack, into pairtree or the new OFS?

Cheers,
-w

[1] http://knowledgeforge.net/pdw/ordf/file/tip/ordf/utils.py
[2] http://knowledgeforge.net/pdw/ordf/file/tip/ordf/handler/pt.py

-- 
William Waites           <william.waites at okfn.org>
Mob: +44 789 798 9965    Open Knowledge Foundation
Fax: +44 131 464 4948                Edinburgh, UK

RDF Indexing, Clustering and Inferencing in Python
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