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PODS'12 Going (Semantic) Web
Next year's PODS 2012, the 31st edition of the established SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, is going to have a special call for "emerging database environments and applications" which happens to be very much geared to Semantic Web/Web of Data technologies. This would be a great chance to get some of the database/data mining/query-related work that is happening around semantic technologies to receive more visibility and appreciation in the database community.
The call for papers is found below. As you can see, more than one of the special areas could fit to (Semantic) Web-related work. Abstract submission is on November 20, so plenty of time to get ready :-) View call for papers …
The State of the UNION: Why no SPARQL Condition Should be Second Class
While implementing RDF-based query answering for Semantic MediaWiki (SMW), I realized that the popular SPARQL query language for RDF has what I consider to be a major design flaw. Admittedly, I had been slightly too optimistic: surely, moving from SQL to SPARQL would be a piece of cake! Have we not had exactly the same RDF-ish data model in mind when designing SMW? And is SMW not a natural friend to all of its fellow Semantic Web technologies? Well, let's just say that the friendship has cooled down a bit in certain matters …Read more …
Ending a Difficult Relationship
Dear MacOS,
the past seven months with you as my single OS were an experience that I don't want to miss, but we just cannot go on like this. I'm exhausted by our quarrels about which window is in front. You wanted to lock me in, but I just felt locked out. I needed my freedom, you just gave me embedded X servers and virtual machines. Don't pretend to be surprised, I know why you wanted to prevent me from shrinking your partition! But your intrigues were in vain, and I have now returned to my first love, Kubuntu. Maybe we can see each other again from time to time. I still love your body, and Kubuntu is completely okay with this, as long as we don't multitouch. Farewell Snow Leopard! No more Cmd+Q disasters, no more "each tool has a different use for the home key" hassles, no more weekly updates for an iTunes I never use!
Markus
P.S. You still had all my emails, although you could never find them with your Spotlight. I moved them to my new home this morning while you were sleeping.
Moving from Linux to Mac
Aug 19 2010. I have recently moved from Linux to Mac, with all the advantages and disadvantages involved. In the process, I logged my customisation steps to create a Mac OS Installation Guide for Linux Users that can probably also be useful to other Linux users.
How to migrate emails from Linux to Mac
Aug 6 2010. I recently had to figure out how to migrate emails from KMail to Mac. Hopefully, my description can be of some use to others who move away from KMail for whatever reason. The basic method should work for moving KMail emails to virtually any other email client, and it can be used even if you cannot run KMail any more (as was the case for me since my Linux laptop passed away one morning without warning).
OWL 2 and how to cite it
Oct 27 2009. It's done! The OWL 2 Web Ontology Language is a W3C Recommendation. Many OWL tools are already compatible with the new specs, and it is expected that all are transitioning to the newer version. OWL 2 consists of many (13) documents, but it has a short overview document and an extended Primer as entry points.
Thus, only one question is left open: how should you cite the new standard? I recommend the following bibtex entries for the aforementioned references:
@book{owl2-overview,
author = {W3C {OWL Working Group}},
title = {{OWL~2 Web Ontology Language: Document Overview}},
publisher = {W3C Recommendation},
note = {Available at \url{http://www.w3.org/TR/owl2-overview/}},
year = {27 October 2009}
}
@book{owl2-primer,
editor = {Pascal Hitzler and Markus Kr\"{o}tzsch and Bijan Parsia and
Peter F. Patel-Schneider and Sebastian Rudolph},
title = {{OWL~2 Web Ontology Language: Primer}},
publisher = {W3C Recommendation},
note = {Available at \url{http://www.w3.org/TR/owl2-primer/}},
year = {27 October 2009}
}
Yes, using @book is a good idea here: bibtex recommends picking reference types by appearance, not by name (and there is no @w3cstandard anyway). The other documents can be cited like the Primer (I just use author for the overview since editor would look inappropriate at this place).
Of course you could also cite a textbook on OWL 2 ;-)
HTML5, RDFa, fights about web semantics
Jul 8 2009. The recent events in the ongoing HTML5 vs. XHTML war, quite unfortunately, are utilised by some to restart a battle of RDFa vs. microformats that appears to be rather pointless. Read more …Theory or Research?
May 5 2009. When doing a review for an IEEE journal, I have been asked to respond to the following question:
Spam without purpose
15 Dec 2008. A spam mail I just received asks me to buy an oil tanker (7,000dwt). Apparently, I am not the first to get such offers. The obvious question is: why? (I note that there is no attachement, no suspicious or different HTML component, not even links to browse to). So here are some hypotheses.Read more …Call for tourists
Sep 17 2008. For making a scientific conference a success, it is of course important to phrase the call for papers in a way that attracts contributions. So what should be written in the first paragraph? Read more …Hard wear
Sep 3 2008. Riding a caster board is a great way of getting to work. It is still important to wear protective gear. In my case, this was my rucksack, filled with a Thinkpad T41p as an additional shock absorber. It still works, though the screen dangles a little on the side where the metal joint has burst. But sitting crouched in front of this laptop for years, my spine had already suffered enough – it was about time for the machine to give something back!How I changed the world
Aug 25 2008. Of course, we all want to change the world, don't we? But in the age of the Web, we may often do so without actually noticing. Quite incidentally, I found out yesterday that I have contributed to possibly thousands of web pages. My contribution is the following:
Read more …
Semantic MediaWiki 1.2: bringing OWL to the Web
Jul 11 2008. After a lot of work it finally done: version 1.2 of Semantic MediaWiki has been released and is available for download. The new release does of course include many new features, but it also has some interesting additions regarding proper Semantic Web technologies. Read more …Semantic Web reloaded
Apr 25 2008. After quite some work during the last week, semanticweb.org now has received a new look and content organisation that is more suitable for the «Homepage of the Semantic Web». The existing content of the former ontoworld.org turned out to be rather more promissing than expected: interesting collections not only of events and people, but also of tools and ontologies did in fact exist. Now it is at the community to take the chance of using this very visible platform for advertising their work. As far as I recon, I better hire some students to support them …Semantic MediaWiki 1.1 released
Apr 20 2008. The new version of Semantic MediaWiki, SMW 1.1, is now available for download. Upgrade from SMW 1.0(.1) is very simple and needs no special scripts, but you will need MediaWiki >=1.11 now. SMW1.1 was tested up to MW1.13 alpha. Besides the mandatory bugfixes, the new release brings various additional features. Read more …Semantic Web Chicken Farms
Feb 8 2008. The Semantic Web community has long contemplated about its very own version of the infamous Chicken and Egg Problem: is it the semantic data or the application for that data that appears first? We always considered Semantic MediaWiki to be an answer to that issue, but now I learned that this is true in rather unexpected ways. More …Happy New Year!
Jan 23 2008. While the world's new year is already three weeks old, and the Year of the Pig still lasts for almost three weeks, Germany has started a new year today: The Year of Mathematics (German link). Good astrological conditions for getting my dissertation done …The Past and Future of Ideas
Jan 18 2008. As Lawrence Lessig – law professor, free-culture proponent, and gifted speaker – announced on Tuesday [1], his latest book «The Future of Ideas» is now free. Download it at the-future-of-ideas.com. Note that the latter should not be confused with what may once become the past of ideas.Mislead by Intuition(ism)
Jan 14 2008. Sure, I could have seen that earlier. Instead, I spent quite some time pondering about how to use intuitionistic semantics as an approximation for faster ontological reasoning. I still claim that this is not completely stupid: intuitionistic logic is known to be strictly weaker than the classical Boolean calculus, and it thus allows us to conclude only some of the classical consequences of, say, an ontological theory. For that purpose it introduces weaker forms of implication and universal quantification, and does not allow for a classical negation operator. So couldn't there be an interesting fragment of intuitionistic logic that is easier to compute with, while still giving a lot of interesting consequences? Probably not – at least I will show below how even weak intuitionistic negation leads to computational intractability. Read more …Semantic MediaWiki 1.0 is available
Dec 31 2007. After a lot of holiday programming, the first stable version of Semantic MediaWiki, SMW 1.0, is now available for download. Among numerous improvements, it introduces semantic RSS feeds, that will also see much use on this site. Read more …
