FOAFBot, Edd Dumbill's RDF-based IRC bot, is back!. Not content with writing readable introductions to FOAF (also in Japanese, Chinese), Edd created one of the most interesting tools that consume FOAF. FOAFBot hangs out in an IRC channel and answers questions about people based on data it found by indexing the Web of interlinked FOAF documents.
FOAFBot is particularly interesting because it keeps track of 'who said what' in the RDF data it collects, even using PGP signatures of the data files where available. This also explains why FOAFBot was offline for a while. Edd's second article on FOAF explained the way in which the original FOAFBot kept track of this 'provenance' or 'attribution' metadata. FOAFBot is written in Python, on top of Dave Beckett's Redland RDF toolkit.
Since FOAFBot was created, Redland and its parser, Raptor, has improved in many ways; in particular Dave added native support for provenance-tracking, via a 'contexts' mechanism. This allows each RDF statement in a database to be tagged with its origins, and allowed Edd to rewrite FOAFBot in a faster and sleeker form. Nice work all round :)
Furthermore, since FOAFBot's data-structures now use Redland's built-in way of representing contexts, FOAFBot databases can now be accessed from all languages that Redland has bindings to (Python, Java, Perl, Ruby, ...). This means that a developer can install Redland and FOAFBot, create an index of FOAF data by running FOAFBot as a harvester ('scutter'), and then access that database from, say, Perl to create alternate views of the data, eg in HTML or SVG.
You can read more on Edd's FOAFBot page or stop by the #foaf IRC channel to see it in action (or talk to other FOAF folk if the bot is offline).
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