- From: Dan Brickley <danbri@danbri.org>
- Date: Wed, 2 Sep 2009 12:20:52 +0200
- To: Toby Inkster <tai@g5n.co.uk>
- Cc: Niklas Lindström <lindstream@gmail.com>, Semantic Web <semantic-web@w3.org>
2009/9/2 Toby Inkster <tai@g5n.co.uk>: > On 2 Sep 2009, at 10:37, Niklas Lindström wrote: > >> * simple file data properties, describing: >> - checksum+algorithm (and/or direct properties for md5, sha1/-2 etc.), >> - filename/slug (unless dct:identifier is suitable enough?). > > foaf:sha1 exists, but that might not be much use if you if you want to... There are some conceptual issues remaining with that property: Q: do we consider it uniquely identifying? if so, then ... of what? (ie. is it owl:InverseFunctional) Even asideConsider two zero-byte files, created by different people, on different machines, and with different creation dates. The empty file will have the same sha1 hash, but the file itself (considered as a manifestation of that null work) has other characteristics that differ. I'd like to have a more careful model for this that brings in some elements of the FRBR work... Something else to look at (if only because it's inside millions of JPEGs and PDFs :) is Adobe's XMP... cheers, Dan
Received on Wednesday, 2 September 2009 10:21:36 UTC