WWW2002 W3C Track -

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21 Οκτ 2013 (πριν από 4 χρόνια και 2 μήνες)

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WWW2002 W3C Track
-

The Semantic Web

by
Eric Miller

Outline


WWW2002 W3C Track
-

The Semantic Web



Outline for the Track



What is the Semantic Web?



Information on the Current Web



Information on the Semantic Web



The Current Web



The Semantic Web
-

A Logical Extension to the
Current Web



The Semantic Web
-

The original web realized



Enabling Technologies
-

Layer Cake



Goals of the Semantic Web Activity



How we're building the Semantic Web


Outline for the Track


What is the Semantic Web?


Overview, goals and objectives


Implementation Strategies


Enabling Standards


RDF Core

-

Brian McBride


Web Ontology

-

Jim Hendler


Semantic Web Advanced Development

-

Ralph Swick


Overview, goals and objectives


SWAD MIT
-

SWAD Europe


Where we are at, where we are going


Semantic Web Demonstration

-

Eric Miller and Tim Berners
-
Lee


Semantic Search


Questions, Answers, Discussion

What is the Semantic Web?


The Semantic Web is an extension of
the current Web that will allow you
to
find
,
share
, and
combine

information more easily.


"The bane of my existence is doing
things that I know the computer
could do for me."
--

Dan Connolly,
The XML Revolution

Information on the Current Web


The current Web represents
information using:


Natural language (e.g., English)


Graphics, multimedia


Page layout


Okay for humans


Difficult for machine processing
(ambiguity, unconstrained data
formats)

Information on the Semantic Web



Extends the current Web


Allows you to:


Express information in a format
that is:


Unambiguous


Amenable to machine processing


Add metadata (to describe existing
or new data)


"A globally linked database
"


The Current Web


Resources:



identified by URI's


untyped


Links:



href, src, ...


limited, non
-
descriptive


User:



Exciting world
-

but, the
characteristics of the documents
is clear to those with a grasp of
(normally) English.


Machine:



Very little information available
-

significance of the links only
evident from the context around
the anchor.

The Semantic Web


A Logical Extension to the
Current Web


Resources:



Common naming syntax (URI's)


Extensible; Relational


Links:



Common naming syntax (URI's)


Extensible; Relational


User:



Even more exciting world, richer
user experience


Machine:



More processable information is
available


Computers and people:



Work, learn and exchange
knowledge effectively

The Semantic Web
-

The original
web realized


The original proposal of the
WWW from 1989 included
a figure showing how
information about a Web of
relationships among
named objects could unify
a number of information
management tasks.


Information Management:
A Proposal
, Tim Berners
-
Lee, CERN, March 1989,
May 1990,

Enabling Technologies



Layer Cake



Goals of the Semantic Web
Activity


Define conventions for applications that
exchange metadata on the Web


Enable vocabulary semantics to be defined
by communities of expertise, not W3C


Provide for the fine
-
grained mixing of
diverse metadata


Making it cost
-
effective for people to
effectively record their knowledge.


Ultimate goal
-

the design of enabling
technologies to support machine facilitated
global knowledge exchange