Web 3.0: Tim, Lucy, and The Semantic Web

The Semantic Web isn't a new idea. This notion of a Web where machines can better read, understand, and process all that data floating through cyberspace—a concept many refer to as Web 3.0—first entered the public consciousness in 2001, when a story appeared in Scientific American. Coauthored by Berners-Lee, the article describes a world in which software "agents" perform Web-based tasks we often struggle to complete on our own.

Web 3.0 : An Introduction

Web 3.0: Tim, Lucy, and The Semantic Web

Web 3.0 :The Other Semantic Web

Web 3.0 :Semantics and Search

Web 3.0 : A Web Beyond Words

Web 3.0 : Tomorrow's Web, Today

Web 3.0 : An Idiot's Guide to Web 3.0

Web 3.0 : Questions of Semantics

Web 3.0 : Look, Ma, No Keywords!

Web 3.0: Versions 4, 5, 6...

The Semantic Web isn't a new idea. This notion of a Web where machines can better read, understand, and process all that data floating through cyberspace—a concept many refer to as Web 3.0—first entered the public consciousness in 2001, when a story appeared in Scientific American. Coauthored by Berners-Lee, the article describes a world in which software "agents" perform Web-based tasks we often struggle to complete on our own.

The article begins with an imaginary girl named Lucy, whose mother has just been told by her doctor that she needs to see a specialist. "At the doctor's office, Lucy instructed her Semantic Web agent through her handheld Web browser," we read. "The agent promptly retrieved information about Mom's prescribed treatment from the doctor's agent, looked up several lists of providers, and checked for the ones in-plan for Mom's insurance within a 20-mile radius of her home and with a rating of excellent on trusted rating services."

That's quite a mouthful, but it only begins to describe Berners-Lee's vision of a future Web. Lucy's Semantic Web agent can also check potential appointment times against her mother's busy schedule, reschedule other appointments if need be, and more—all on its own, without help from Lucy. And Lucy is just one example. A Semantic Web agent could be programmed to do almost anything, from automatically booking your next vacation to researching a term paper.

How will this actually work? In Berners-Lee's view, it involves a reannotation of the Web, adding all sorts of machine-readable metadata to the human-readable Web pages we use today (see "Questions of Semantics," opposite). Six years after the Scientific American article, official standards describing this metadata are in place—including the Recourse Description Framework (RDF) and the Web Ontology Language (OWL)—and they're already trickling into real-world sites, services, and other tools. -Semantic Web metadata underpins Yahoo!'s new food site. Spivack's Radar Networks is building a kind of Semantic Web portal. A development platform, Jena, is in the works at HP. And you'll find Semantic Web structures in Oracle's Spatial database tool.

The problem is that a complete reannotation of the Web is a massive undertaking. "The Semantic Web is a good-news, bad-news thing," says R. David Lankes, an associate professor at Syracuse University's School of Information Studies. "You get the ability to do all these very complex queries, but it takes a tremendous amount of time and metadata to make that happen."