Semantic Web

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What Is The Semantic Web? (Infographic)

Semantic Web Standards

Semantic Web Standards From Semantic Web Standards In addition to the classic “Web of documents” W3C is helping to build a technology stack to support a “Web of data,” the sort of data you find in databases. The ultimate goal of the Web of data is to enable computers to do more useful work and to develop systems that can support trusted interactions over the network.
RDF/XML Syntax Specification (Revised) RDF/XML Syntax Specification (Revised) Status of This Document This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at This document is an edited version of the 2004 RDF XML Syntax Specification Recommendation. The purpose of this revision is to make this document available as part of the RDF 1.1 document set.
Quick Intro to RDF This is a really brief introduction to Resource Description Framework (RDF). You might also be interested in... For a more detailed look at RDF, see RDF in Depth on this site, which this page was based on. Two video introductions to the Semantic Web and RDF and RDFa by Manu Sporny are very good. Ian Davis's RDF Tutorial slides are also very good. Quick Intro to RDF Quick Intro to RDF

How RDF Databases Differ from Other NoSQL Solutions - The Datagraph Blog

This started out as an answer at Semantic Overflow on how RDF database systems differ from other currently available NoSQL solutions. I've here expanded the answer somewhat and added some general-audience context. RDF database systems are the only standardized NoSQL solutions available at the moment, being built on a simple, uniform data model and a powerful, declarative query language. These systems offer data portability and toolchain interoperability among the dozens of competing implementations that are available at present, avoiding any need to bet the farm on a particular product or vendor. How RDF Databases Differ from Other NoSQL Solutions - The Datagraph Blog
Demo.demo.Orders: Northwind RDF View Definition prefix northwind: <> ... create iri class northwind:Order <http://^{URIQADefaultHost}^/Northwind/Order/%d#this> (in order_id integer not null) . ... alter quad storage virtrdf:DefaultQuadStorage ... from Demo.demo.Customers as customers from Demo.demo.Orders as orders ... OpenLink Virtuoso - RDF Views (1) OpenLink Virtuoso - RDF Views (1)
FOAF Vocabulary Specification Classes Class: foaf:Agent Agent - An agent (eg. person, group, software or physical artifact). The Agent class is the class of agents; things that do stuff. A well known sub-class is Person, representing people.

FOAF Vocabulary Specification

C Semantic Web FAQ C Semantic Web FAQ The term “rules” in the context of the Semantic Web refers to elements of logic programming and rule based systems bound to Semantic Web data. Rules offer a way to express, for example, constraints on the relationships defined by by RDF, or may be used to discover new, implicit relationships. Various rule systems (production rules, Prolog-like systems, etc) are very different from one another, and it is not possible to define one rule language to encompass them all. However, it is possible to define a “core” that is essentially understood by all rule systems. This core is based on restricted kind of rule, called a “Horn” rule, which (like most rules) has the form “if conditions then consequence”, but it places certain restrictions on the kinds of conditions and consequences that can be used.
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