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Re: RDF Update Feeds

From: Benjamin Nowack <bnowack@semsol.com>
Date: Wed, 2 Dec 2009 09:49:44 +0100
To: public-lod@w3.org
Message-ID: <PM-GA.20091202094944.6CF58.1.1D@semsol.com>

On Fri, 20 Nov 2009 18:35:05 Alexandre Passant wrote:

>What about using RSS feeds (w/ RDF extensions) combined with RSSCloud  
> or PubSubHubbub ?


I started working on a PuSH/RDF implementation a few weeks ago. Any 
recent project I'm involved in seems to require a more real-time-ish 
experience, and PuSH/PSHB is a very elegant and pragmatic solution. 

A very nice add-on is that it supports simple private update streams
(you can for example push profile updates to selected people in your 
address book w/o too much hassle). What I also like is the ability to
hook into the wealth of RSS/Atom feeds already out there, even though 
you still have to implement a polling mechanism for legacy feeds that
don't support pub/sub yet. 

PuSH needs asynchronous processing and job queues, and writing a 
compliant hub is not trivial. But compared to implementing RDF 
specs, I dare say it's pure joy ;)

For resource updates and predicate-level changes (maybe even object-
level, not sure yet), I'm looking at Atom Activities[1]. They are a 
bit like RDF, and more obvious than a directly embedded SPARQL/Update
query. Translating incoming RDF activities to Talis Changesets or 
SPARQL INSERTs/DELETEs seems to be straight-forward, but I'm not 
there yet code-wise, so this is really just a guess so far.


[1] http://activitystrea.ms/

Benjamin Nowack
Received on Wednesday, 2 December 2009 08:50:12 UTC

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