Pages tagged with Rdf

Unlike traditional search engines, which crawl the Web gathering Web pages, Semantic Web search engines index RDF data stored on the Web and provide an interface to search through the crawled data. Below is a list of Semantic Web search engines that are currently under development.

Continue reading Semantic Web Search Engine Roundup

Update: 302 Semantic Web Videos and Podcasts!

I've compiled a list of videos about the Semantic Web, RDF, and OWL for your viewing pleasure! Most of these videos are short, ranging from about 6 to 10 minutes while others are long (45+ minutes). Included are a few introductions, a few interviews, and a few that get into the gritty details.

Continue reading 17 Semantic Web, RDF, and OWL Videos

Open Calais - a new and smart API from Reuters - finally does what critics say to be the greatest obstacle to the Semantic Web: Taking the metadata burden from the end-user by providing an automatic meta-tagging tool. The principle behind Open Calais is easy: Put in some unstructured text and get in return nicely structured RDF-data. Backed by powerful Text Mining and machine learning techniques the API automatically detects entities like persons, events, countries and other facts.

Open Calais takes account of the fact that the added value of content is hidden in its structure. Uncovering that structure and representing it in a interoperable format makes existing resources more programmable and reusable.

But what is in for Reuters? Nothing less than the biggest structured content repository on the web. Should not we talk about this little fact as well?

We're still using Protege, but this time working with the new ALPHA version and getting deeper into concepts.

Get the Flash Player to see this player.

semantic weltbild 2.0 wrote a short article about NEPOMUK-KDE, a project whose aim is to bring RDF's resource annotation to the KDE desktop environment. NEPOMUK-KDE is a sub-project of the Semantic-Desktop project Nepomuk which aims to provide a full implementation of the standards and APIs defined in Nepomuk on the KDE desktop. As a sub-project of Nepomuk the two main issues are the maintenance and intensive usage of metadata throughout the desktop and powerful peer-to-peer collaboration techiques. This is accomplished in part by ditching the simplistic, string-based tagging model in favor of using RDF. If only this was for GNOME. Check it out!

Danny Ayers has updated the RDF Review Vocabulary with a handful of new terms (suggested by ITerating and Revyu, two entities currently deploying this vocabulary), and also made it OWL DL-friendly. He's also set it up as a GRDDL-enabled HTML meta data profile for the hReview microformat. He says still has some debugging to do, and wants to put together a diagram showing the classes and properties.

Continue reading Updates Made to RDF Review Vocabulary

Today we reach an important milestone in this series. We are crossing a great divide between familiar technologies such as XML, Unicode, URI, and RDF to the Web Ontology Language (OWL). This, my friends, is where things really start to get interesting because this is the point where the Semantic Web vision really starts to take form. Today, we present a screencast exhibiting Protégé — a free, open source ontology editor and knowledge-base framework developed by Stanford Center for Biomedical Informatics Research at the Stanford University School of Medicine. In this screencast, we show you how to develop a useful Semantic Web-ready application in just minutes. You will learn how to model a very simple ontology in OWL (the Web Ontology Language).

Continue reading Introduction to Semantic Web Vision and Technologies - Part 4 - Protege 101 (Screencast)

Update: Joe from the Squio blog has posted a response to this entry.

Microformats are a wildly popular set of formats for embedding metadata within normal XHTML. The primary advantage Microformats offer over RDF (including its embedded serializations) is that you can embed metadata directly in the XHTML, reducing the amount of markup you need to write (e.g. you don't have to write XHTML and additional RDF). Many people have contended that Microformats are a possible replacement for RDF, however Microformats were not designed to cover the same scope as RDF was. While both Microformats and RDF make it possible to store data about data, they simply do not work to solve the same set of problems.

Continue reading Microformats vs. RDF: How Microformats Relate to the Semantic Web

In Part 2 of this series we reviewed Unicode, URI, and XML - three foundational technologies that permeate the existing Web and that are especially relevant to the emerging Semantic Web. We will put all three to use as we take our next step up the Semantic Web layer cake in a review of the Resource Description Framework (RDF). At the same time, we will be taking the visual RDF/OWL editor, Altova SemanticWorks, for a test drive. Since I will be using this tool for the very first time, you can expect an honest review that is rich with screenshots. If you do not already have the software, you may wish to download the trial version now so you can follow along.

Continue reading Introduction to the Semantic Web Vision and Technologies - Part 3 - The Resource Description Framework

Hey everyone, I've gathered some good reading material for your enjoyment! If you're new to the Semantic Web or just want to brush up on your knowledge then take a look at the following articles. Listed below are over thirty introductions, primers, references, guides, and tutorials on the Semantic Web, RDF, OWL, SPARQL, and GRDDL. If you know of other articles that would fit well here leave me a comment and I'll be happy to add them to the list. Enjoy!

Continue reading 30+ Semantic Web Introductions, References, Guides, and Tutorials