Ivan’s private site

January 28, 2008

Overview paper on SAWSDL in IEEE Internet Computing

Filed under: Semantic Web, Work Related — Ivan Herman @ 11:12

Jacek Kopecký, Tomas Vitvar, Carine Bournez and Joel Farrell have published an overview paper on SAWSDL in the December issue of IEEE’s Internet Computing[1]. It is unfortunate that IEEE does not put its proceedings into the public domain, but, well… Maybe some of the readers have access to IEEE’s Digital Library. In any case, here is the abstract of the paper:

Web services are important for creating distributed applications on the Web. In fact,they’re a key enabler for service-oriented architectures that focus on service reuse and interoperability. The World Wide Web Consortium (W3C) has recently finished work on two important standards for describing Web services: the Web Services Description Language (WSDL) 2.0 and Semantic Annotations for WSDL and XML Schema (SAWSDL). Here, the authors discuss the latter, which is the first standard for adding semantics to Web service descriptions.

[1] Kopecký, Jacek, Tomas Vitvar, Carine Bournez, and Joel Farrell. “SAWSDL: Semantic Annotations for WSDL and XML Schema.” IEEE Internet Computing 11, no. 6 (2007): 60-67. See also the online reference on the IEEE site.

Addendum on the 29th: Jan Zemanek commented that the paper is available on-line on Tomas Vitvar’s site! (Thanks Jan)

January 22, 2008

Couperin, Duphly

Filed under: General, Private — Ivan Herman @ 19:35

The beauty of (classical) music is that after many years one can still discover new things, new pieces that, for various reasons, one has not heard before… The last in the line for me was the discovery of the keyboard music of François Couperin, thanks to a program on the French public radio channel, France Musique. More specifically, the record I discovered was a collection of some of Couperin’s keyboard pieces by Alexandre Tharaud. 19 different pieces, all very different from one another, and astonishingly modern and romantic. But the real novelty for me was a beautiful short piece, called “La Pothouïn”, of another French composer called Jacques Duphly. I must admit: this is the first time I even heard this name! So many things still to discover…

There is also a more personal aspect of this music. I have lost a dear colleague/friend about a year ago, who was a great fan of ancient music. This was really “his” music. I know he would have loved this recording…

January 18, 2008

Using GRDDL and/or RDFa to annotate REST services

Filed under: Semantic Web, Work Related — Ivan Herman @ 12:53
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Carine Bournez (merci, Carine!) drew my attention to a position paper of Karthik Gomadam et al.[1] An extract of the paper that could also be considered as an abstract:

“Reuse and data mediation have led to several proposals for Semantic Web services, leading to the W3C recommendation for the Semantic Annotation of WSDL and XML Schemas. But adding semantics to REST is more challenging than adding semantics to WSDL. Unlike WSDL, REST-based services are often embedded in Web pages written largely in XHTML.”

The authors propose the usage of a small vocabulary plus GRDDL and RDFa, which, combined with the XHTML file containing the reference to the REST service, can provide a proper Semantic description. A simple but powerful use case both for GRDDL and RDFa…

As an aside, the following paragraph, comparing GRDDL and RDFa, is also interesting by itself (thanks to Mark Birbeck for pointing that out in a mail):

“GRDDL’s advantage is that it’s less intrusive than RDFa, and it lets the user embed annotations in whatever way is most convenient to them. RDFa’s advantage is that annotations are self-contained in the HTML page, so the user only needs to create and maintain a single document (GRDDL forces the user to create two documents, the HTML page and the translation document). RDFa also has the advantage of being a standardized microformat, which makes it simpler for a developer to maintain and understand a page created by someone else.”

[1] K. Gomadam, A. Ranabahu, and A. Sheth, “SA-REST: Semantically enhancing REST services (SWS-XG position paper and discussion draft)”; http://knoesis.wright.edu/research/sss/standards/sa-rest/.

January 6, 2008

BB King and Tátrai…

Filed under: General, Private — Ivan Herman @ 15:58
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Part of my standard actions at the beginning of the year is to clean up my browser bookmarks. So I did today, and I found two references to YouTube videos that I’d stored sometimes last summer. They are both extracts from a concert given ten years ago by BB King in Budapest, together with an amazing Hungarian jazz guitarist called Tibor Tátrai. There is some sort of a nostalgia for me in that; Tátrai was part of an absolutely amazing jazz-rock group (called Syrius) that was around in Budapest for 2-3 years when I was young (i.e., early 70’s). There are some traces of that group on YouTube, if you are interested, but the group has disappeared very quickly…

Anyway, here are the two BB King & Tátrai videos if you are interested in jazz and blues:

and

January 5, 2008

The wise friend of Michael…

Filed under: General, Private — Ivan Herman @ 15:07

I wish I was as wise as Michael Sperberg-McQueen’s unnamed friend: “…always dare to be wrong, even if you’re not sure you are.” But it is difficult to exceed one’s instincts… :-(

January 1, 2008

The Manhattan Project

Filed under: General, Private — Ivan Herman @ 16:00
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A friend of mine (Bebo White) drew my attention on the “Manhattan Project” book[1], which turned out to be really interesting. It is not yet another history book on the Manhattan Project, but rather a compilation of eyewitness accounts, of texts of those who had written on the subject, and even extracts of fiction that used the Manhattan Project as a background. Despite its nature the book it gives a good overview of what happened and, because it is a compilation of sources, it reflects the sometimes conflicting opinions on the more controversial issues.

In some ways, the last two chapters of the book (“Reflection on the Bomb” and “Living with the Bomb”) were the most interesting for me. The chapter on reflections shows the enormously diverging views on the issue whether the US was justified or not to use the bomb in Hiroshima and Nagasaki. There are 13 different texts there, and almost 13 different views… In some ways, the short text written in 2005 by Gar Alperovitz sums up the situation the best: “One might think that by now historians would agree on all fundamental issues. The reality, however, is just the opposite. All the major issues involved in the decision are still very much a matter of dispute among experts.” I must say I did not realize that before.

The last chapter (“Living with the Bomb”) is even more discomforting. I personally grew up in a World when the A- and H-bombs were the constant subjects of political discourse. However, since the end of the Cold War, this issue has pretty much disappeared from the collective psyche, as if the problem had gone away. Far from being true… The book cites two articles that were published about a year ago: a paper written by a number of US politicians from both sides of the aisle[2] and another one written by Mikhail Gorbachev[3], both arguing that, well, the issue is still very much alive (to say the least) and that major powers should make decisive steps towards a complete elimination of those weapons. And it is not comforting at all that none of these papers were discussed publicly (not being a regular reader of the Wall Street Journal I did not hear about them until now). The recent turmoils in Pakistan, i.e., the danger of an A-bomb falling into the hands of a completely chaotic and disorganized political leadership is just a reminder of the danger…

Good book. Worth reading it.

[1] Cynthia C. Kelly. The Manhattan Project: The Birth of the Atomic Bomb in the Words of Its Creators, Eyewitnesses and Historians. Black Dog & Leventhal Publishers, 2007

[2] George P. Shultz, William J. Perry, Henry A. Kissinger and Sam Nunn: A World Free of Nuclear Weapons, Wall Street Journal, January 3, 2007.

[3] Mikhail Gorbachev, The Nuclear Threat, Wall Street Journal, January 31, 2007

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