This article introduces core Semantic Web concepts and standards and explains how to expose an LDAP directory as a service that Semantic Web applications can consume using the open source SquirrelRDF utility.
Archive for the ‘RDF’ Category
Expose LDAP directories to the Semantic Web with SquirrelRDF
SemSol
SemSol is a forthcoming Web development framework that uses Semantic Web technology to significantly increase productivity and flexibility for everyday Web programming.
Hmm, the description on the page sounds really promising. It uses hot things like SPARQL, RDF, microformats and so on.
Hope there will soon be some more information.
DBpedia II.
Just found another posting about DBpedia in a blog of one of the developers. It tells you a little bit more about the backgrounds of this great project.
Taking Wikipedia to the next level
Just read something about the following project:
DBpedia.org is a community effort to extract structured information from Wikipedia and to make this information available on the Web. DBpedia allows you to ask sophisticated queries against Wikipedia and to link other datasets on the Web to Wikipedia data.
Instead of searching the full-text of Wikipedia, it allows you to execute SPARQL-Queries on the data. With “the data” i mean RDF-Data. Because the goal of the DBpedia-project is to create a whole bunch of structured data out of the Wikipedia-texts.
A little search interface can be found at http://dbpedia.org/search/.
Oort
Oort is a toolkit for creating RDF-driven WSGI-compliant web applications.The purpose of this is to make it easy to create web views of RDF Graphs by using some declarative python programming.
Oort uses RDFLib, Paste and Genshi for the heaving lifting. Initial support for Template Plugins alá Buffet and TurboGears is included (but ain’t 100% full-proof yet).
Atomic: Client for the Queso Server
Atomic is a client for the Queso Server. (Runs only on M$ Windows Boxes)
Posting to the Queso-Sever using Apache Abdera
Ben Szekely has posted an example for accessing his Queso-Server with Apache Abdera. The important part is
AtomClient client = new AtomClient();
Entry postedEntry = client.post("http://abdera.watson.ibm.com:8080/atom/example", entry).getRoot();
where ‘entry’ is the Atom element.
Queso. RDF storage. Atom based.
Elias Torres, Wing Yung and Ben Szekely have created an ATOM-Server called Queso with a little interface using AJAX:
Queso is a J2EE-style application that implements the Atom Protocol specification currently in draft-09 atop an RDF server called Boca (the restaurant’s name is Boca Grande, a.k.a. Big Mouth) using Henry Story’s Atom OWL for the model and of course opening up a SPARQL endpoint to query the contents the store.
The actual data-storing takes place using RDF-Data. But the data is inserted by the user or the machine using Atom-syntax:
Content is inserted into the system is by posting Atom entries. The entries are stored as RDF (converted via Atom OWL by Henry Story), so their content and metadata is accessible via SPARQL queries. [...]
But test yourself under http://abdera.watson.ibm.com:8080/browser/. Its very rudimental so far, but looks promising.
Welkin: RDF Graph Browser
Vorhin entdeckt, scheint es aber schon etwas länger zu geben. Ein Java-basierter Browser für RDF-Graphen: Welkin. RDF-Datei laden und *zack* erscheint der passende visualisierte Graph.
RDF zur Beschreibung von Open Source Projekten
Ein kompaktes RDF-Vokabular zur Beschreibung von Open Source Projekten: DOAP (Description of a Project).
Die DOAP-Beschreibung zum DOAP-Projekt gibt es z.B. hier.
Die dazu passende Grafik gibt es auch: 
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