On Fri, Oct 9, 2009 at 11:23 PM, abstract things <abstractthi...@gmail.com>wrote:
> Hello All, > > My name is Sundar and I am Senior Python programming language user [?] (I > mean 3+ years). I like Python programming. Well, I haven't registered for > PyCon early enough but I attended Mayavi, Algorithms and Semantic Web talk. > Wanted to attend many other interesting talks as well but time didn't permit > me. So following some of the online material now. > > I also have very much interest in Semantic Web but I some how don't agree > with the Anand's post. No offence Anand. I am following Semantic Web since > 2005 onwards (soon after the SPARQL draft was out) and have been active > member in online Semantic Web groups. Open Calais is a Web service which > stores data/information with Semantics. When we access Open Calais store by > its APIs, what we get in return is JSON format (may be others as well, I > haven't explored much its API) results with entity and value etc. But that is > something like taking data out from your database after sending a query. If > somebody follows WordNet and NLP can figure it out with document > classification algorithms that the particular text you are sending to Open > Calais has what semantics associated (associated Nouns, Verbs e.g. Person, > place, actions, class of the text i.e. sports, politics, history etc). > > Arranging this information on our webpage or blog is not the Semantic Web. I > would call it as fetching data from a Semantic Data store and arranging it on > our webpages so that Search engines can find it in better manner or we can > have quality or enriched information on our webpages (one can use RDFa). > Semantic Web is what happening inside Open Calais along with other > Linguistics based features for extracting meaning of the data we send or ask > through API. And no way anybody can call this as ONTOLOGY. Ontologies are > like domain modelling, a hard thing). Ontologies are inside thing of Open > Calais. What we get out from their data store is not an Ontology. Its simply > the data with semantics we are getting (just the relationships without > actually knowing the domain model built inside). We no way have any knowledge > of how the data inside Open Calais is stored and what their ontology for a > particular domain is (Something similar to getting results out from a > database without knowing what the internal schema is). > > Semantic Web basic concept has RDF (which is in turn an XML based standard). > What that guy in PyCon showed in his presentation was a direction to think > about Semantic Web if you yourself is building some Semantic Web based system > (eg. if your company wants to launch some online system with Semantic Web > features then you can have your domain vocabulary defined and accessible > using a URL, also how the RDF statements can be made, what are the best > practices for making such statements etc). His talk was more of focused on > large Enterprise systems and integrations compared to using Semantic Web for > Web page based data annotation. (Micro formats is not the part of W3C based > Semantic Web protocol stack). > > Based on my limited knowledge, RDFa and GRDDL are the two standards from W3C > that can be used for Web content annotation and the RDFLib (that guy used > this library in his practical Python examples if you remember) can generate > RDFa documents from the triples you have in your datastore (see his last 3 or > 4 slides). RDF based XML documents can be generated from a Web application or > an enterprise application for semantic based data exchange. > > Well, my thoughts here are not to argue on any thing but to give a picture of > Semantic Web from my acquired knowledge in last 4or so years. (and also the > perspective of that guy as I observed). > > I guess it would have been more interesting if that guy would have given few > examples of using Description Logic to describe data relationship and how OWL > fits into that model and also about Stanford's Semantic Web Protege editor or > some other editors for designing Ontologies. I guess it requires more than 45 > min. > > Nevertheless, his talk was satisfying for me, may be because I already had > background knowledge of this subject. > > > Regards, > > Sundar > > > > On Fri, Oct 9, 2009 at 4:48 PM, Arvind Jamuna Dixit <ardsrk at gmail.com > <http://mail.python.org/mailman/listinfo/inpycon>>wrote: > > >* Semantic web and python. Pretty cool stuff. I am interested.* > > Cool. Here is a brief of what I want to present. > > Anyone who attended the talk on Semantic web in Pycon would have > understood something about the "theorotical" semantic web as > visualized by W3C. > > This is however a top-down approach which requires annotating > web-pages with metadata such as RDF, microformats etc. > > However a more practical approach is extracting > semantic content namely ontologies and relationships from existing > web content. Such services are already becoming available. > > I will be demonstrating such a web-service namely "OpenCalais" > by Reuters and how to use it in Python to develop some applications > using the rich semantic data returned by the service. > > The whole session will be interactive and about showing running > Python code, and will last from 45min - 1 hour. > > > I am sorry, but I decided not to present this talk tomorrow. I had thought of presenting OpenCalais as an example of top down semantic web but with some prejudices already about the topic, I think I will be better off with presenting something more than just that. I am working on an idea which I have to use the service to build up a semantic web application which uses OpenCalais to extract data and present it via other web 3.0 services. However it won't be ready by tomorrow and I dont have the time to hack something up quick. Next week-end I will have something to present on this and I think it will be better to present everything together than piece by piece. So this talk is canceled tomorrow. Let us have the PyCon follow-up discussions.
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