mhausenblas.blogr.com - Tag 'tools' (RSS 2.0)

The Semantic Web Command Line

mhausenblas — Wed, 20 Feb 2008 22:28:14 +0100

Ever have wondered if there is something around like a command line for the Semantic Web? An online tool that allows you load and query a range of data sources? Well, peradventure Benjamin Nowack has developed a tool, called SPARQLBot, that does all this. It is really great. You launch your favourite IRC client (I use Hydra IRC) and then you (or a SPARQL geek near to you) defines a command that does something useful. Pull in some data, query it, smush it, etc.

Check it out! Play around with it. Experience how to instant-integrate data source on an RDF-basis. You will enjoy it. An example may better illustrate it: Imagine you've joined the #sparqlbot channel at irc:irc.freenode.net; you query for news (from an RSS channel):

mhausenblas>sparqlbot, load <FEEDURI>
mhausenblas>sparqlbot, news about XXX

What happens in the background is that the feed gets loaded into the store, and the command triggers a SPARQL query:

SELECT DISTINCT ?item ?o WHERE {
?item a rss:item ; ?p ?o .
FILTER REGEX(?o, "$1", "i")
}

Isn't that great? I experienced it today. It really rocks :) You can add your own commands (given some basic SPARQL knowledge) and extend the bot's intelligence. Not to mention that this nice tool (being based on ARC2) even understands RDFa - very nice, indeed (try also the 'sw faq command'). However, the name SPARQLBot is to modest, IMHO. It is THE Semantic Web command line!

An RDFa browser

mhausenblas — Sun, 02 Sep 2007 20:35:13 +0200

Did you know that the Zitgist RDF browser actually supports RDFa? This is to say you can feed the browser with XHTML+RDFa (see example) and it will render it!

Ok. It has some minor hiccups (seems to duplicate each prop) ... but hey ... it's a start.

Swoogle, Swoogle

mhausenblas — Fri, 20 Jul 2007 12:00:12 +0200

Tim Finin recently announced a new version of Swoogle, THE Semantic Web search engine. After some initial hiccups the service now seems to work fine, again. Thanks to the UMBC eBiquity team, you're doing a great job!

One thing puzzles me. Though I read the manual (which seems a bit outdated), I did not figure out how to find certain instances. Take for example the query 'return all documents that have a foaf:mbox = abc@example.org in it'. I'll continue the experiments ;)

Nice gadget found at flickr's

mhausenblas — Tue, 13 Mar 2007 21:22:59 +0100

Just browsed through flickr's services, and found:

http://labs.systemone.at/retrievr

This nice litte gadget allows for retrieving photos by either sketching them or uploading a reference image. Fun, fast, and addictive ;)

Using RDF on the Web: A Survey

mhausenblas — Wed, 17 Jan 2007 14:43:52 +0100

Lee Feigenbaum made an excellent survey on using RDF on the Web available.