Semantic Web The Web with Semantics. What is the Semantic Web?  Knowledge Representation on the (decentralized) web.  Definitions from Google Definitions.

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Presentation transcript:

Semantic Web The Web with Semantics

What is the Semantic Web?  Knowledge Representation on the (decentralized) web.  Definitions from Google Definitions from Google

Key Features of the Semantic Web  Content meaningful to computers XML, RDF  Defining the world in objects (xml)  URIs, not words, for concepts and associations.  Decentralized and open anyone can publish data about anything

Decentralized and Open  Anyone can define attributes of anything.  Berner’s Lee says Web doesn’t discriminate between “paper napkins” and well-thought out refereed articles. Is this true?

The Old Web Database ServletServer dynamic page static page

The Web with Semantics Database Service xml Server rdf Servlet Database

The Web with Semantics Database Service xml Server rdf Servlet Database Objects, Associations, Reasoning Rules

3-Layer DB Approach on the Web Database Service xml Server rdf Servlet Software Agent

Sample Questions for the Semantic Web  Find the Ms. Cook I met at a trade conference last year.  Get me a list of all academic publications concerning metasearch systems

Traditional Knowledge Representation  Closed Systems that can’t talk to each other  Narrow, Idiosyncratic

Knowledge Representation on Web  RDF is the glue  Formerly closed systems can publish RDF  Can also publish RDF translators vis-à-vis similar systems  There’s a lot of low hanging fruit.

XML  XML clause is: property:string value:string  wolber  An object is a hierarchical set of clauses wolber david 

RDF adds universality and subjects to each clause  RDF Clause is a triple subject:uri – property:uri – value:uri

XML vs. RDF wolber david

Property is a URI  Can go there and see precise definition  Allows standards to build up e.g., dublin core, foaf  People can write equivalence equations with RDF.

In-Class Research Assignment  There is foaf, dublin core, rdf  Let’s compile a catgorized listing of all rdf schemas, including those.  Films, Books, relationships between people…  Let’s build a wiki page on it.