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With the exception of a not unfamiliar round of bile spilling about SOAP and web services, recent weeks have been quiet in the XML developer community. Those eager futurists from the RDF interest list have kept going, however, and an overview of that activity forms the core of my report this week.
Type: RDF #Views: 585 Category: Article
Your RDF Query Language?
Among the several hats I wear these days -- including Managing Editor of O'Reilly's XML.com -- I'm also a member of the Data Access Working Group (DAWG), which is working on standardizing a query language and access protocol for RDF, the lingua franca of the Semantic Web. The DAWG has recently released the 2nd draft of its Use Cases and Requirements doc, which we're encouraging people to read and comment on. This document contains an odd baker's dozen of use cases -- little stories where we think a standard RDF query language would help you get the job done.
Type: RDF #Views: 554 Category: Article
All Roads Lead to RDF
August. Season of long, hot, lazy days, and not much else. While the vacation of all things XML continues, those eager RDF folks are still hard at work. Consequently, the XML-Deviant this week focuses largely on RDF-related topics.
Type: RDF #Views: 523 Category: Article
Introduction to Jena: Use RDF models in your Java applications with the Jena Semantic Web Framework
RDF is increasingly recognized as an excellent choice for representing and processing semi-structured data. In this article, Web Developer Philip McCarthy shows you how to use the Jena Semantic Web Toolkit to exploit RDF data models in your Java applications.
Type: RDF #Views: 784 Category: Article
Putting RDF to Work
Over recent months, members of the www-rdf-interest mailing list have been working at creating practical applications of RDF technology. Notable among these efforts have been Dan Connolly's work with using XSLT to generate RDF from web pages, and R.V. Guha's lightweight RDF database project.
Type: RDF #Views: 573 Category: Article
Using the Jena API to Process RDF
There has been growing interest in the Resource Description Framework (RDF) and a number of tools and libraries have been developed for processing it. This article describes one such library, Jena, a Java API for processing RDF. It is also the name of an open source implementation of the API.
Type: RDF #Views: 590 Category: Article
RDF - What's In It For Us?
RDF - the Resource Description Framework - is a foundation for processing metadata; it provides interoperability between applications that exchange machine-understandable information on the Web. RDF emphasizes facilities to enable automated processing of Web resources. RDF metadata can be used in a variety of application areas.
Type: RDF #Views: 496 Category: Article
Declarative RDF Models for feature-based targeting of content to multiple devices
We discuss an approach for targeted transformations of content to open sets of devices. The key element of this approach is the RDF Model that represents devices as sets of generic features and represents content resources as sets of components. The other key element is the RDF server utilizing this Model to support transformations across different devices and presentation channels. We illustrate our approach with an example that involves aggregating content and transforming it for display on wireless devices.
Type: RDF #Views: 486 Category: Article
An introduction to RDF
This article introduces Resource Description Framework (RDF), developed by the W3C for Web-based metadata, using XML as an interchange syntax. RDF's essential aim is to make work easier for autonomous agents, which would refine the Web by improving search engines and service directories. Author Uche Ogbuji gives an overview of RDF aspects from schemas to usage scenarios. The article assumes that you are already familiar with XML.
Type: RDF #Views: 487 Category: Article
RDF PNG Icon
Type: RDF #Views: 577 Category: Article
RDF: Extending and Querying RSS channels
This document explores some examples based around the idea of extending RSS using RDF-based modularisation, and then querying the resulting data in ways that exploit those extensions.
Type: RDF #Views: 226 Category: Article
Basic XML and RDF techniques for knowledge management, Part 1
Columnist Uche Ogbuji begins his practical exploration of knowledge management with XML by illustrating techniques for populating Resource Description Framework (RDF) models with data from existing XML formats. As shown in the three code listings, RDF can be used as a companion to customized XML, not just as a canonical representation for certain types of data. This column, with code samples included, demonstrates how easy it can be to jump-start knowledge management with RDF even relatively late in the development game.
Type: RDF #Views: 215 Category: Article
Building Metadata Applications with RDF
The real test of any technology's value is what kinds of tasks are easier with it than without it. If I hear about some new technology, I'm not going to learn it and use it unless it saves me some trouble. Well, being a bit of a geek, I might play with it a bit, but I'm going to lose interest if I don't eventually see tangible proof that it either makes new things possible or old things easier.
Type: RDF #Views: 219 Category: Article
This week the XML Deviant returns from holiday to find that, although the W3C's Resource Description Framework (RDF) technology appears to be gaining supporters, developers still have many concerns about the complexity of its syntax.
Type: RDF #Views: 218 Category: Article
Should Atom Use RDF?
The problem with discussing RDF (where that means, "I think this data format should be RDF") is that you can support any four of these RDF issues (model, syntax, tools, vision), in any combination, while vigorously arguing against the others. People who believe that the RDF conceptual model is a good thing may think that the RDF/XML serialization is wretched, or that there are no good RDF tools for their favorite language, or that the Semantic Web is an unattainable pipe dream, or any combination of these things.
Type: RDF #Views: 163 Category: Article
The W3C working group tasked to update and clarify the RDF specification recently released six new working drafts. The group is collecting comments, concerns, and corrections, which will be incorporated into the documents. At the end of November, in preparation for submitting the documents for review as Candidate Recommendations, the working group will begin its final review.
Type: RDF #Views: 147 Category: Article
RDF Applications with Prolog
In the first article in this series, I explained some of the semantics of RDF via Prolog (and vice versa). In this article, I'll explore some of the nitty-gritty of working with RDF in Prolog using the SWI-Prolog system.
Type: RDF #Views: 217 Category: Article
rdf: in fifty words or less
Okay, so maybe this is a bit more that fifty words, but the key points are pretty simple (and put into bold text for you manager-types who just want to get straight to the point). The Resource Description Framework, or "RDF", is really two things.
Type: RDF #Views: 149 Category: Article
The Social Meaning of RDF
One of the enduring joys of having a pulpit, such as is provided by the XML-Deviant column, is the chance to ride one's own hobby horses. While the point of the XML-Deviant column is to represent the most interesting and important facets of debate within the XML development community, it also affords me a chance to promote or demote things, based upon my sense of what is true, good, right, or useful.
Type: RDF #Views: 197 Category: Article
An Introduction to the Resource Description Framework
The Resource Description Framework (RDF) is an infrastructure that enables the encoding, exchange and reuse of structured metadata. RDF is an application of XML that imposes needed structural constraints to provide unambiguous methods of expressing semantics. RDF additionally provides a means for publishing both human-readable and machine-processable vocabularies designed to encourage the reuse and extension of metadata semantics among disparate information communities.
Type: RDF #Views: 207 Category: Article
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