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Alessandro Marcias
SEMANTIC WEB
WHAT’S THIS PRESENTATION ABOUT?

Describe the components of the Semantic
Web’s Architecture & Technologies in a bottomup approach
http://www.w3.org/2000/Talks/1206-xml2ktbl/slide10-0.html
Unicode
THE UNICODE IS THE STANDARD FOR
COMPUTER CHARACTER REPRESENTATION
web
Unique Resource Location
URIs(Uniform Resource Identifiers)
XML
<?xml version="1.0"?>
<CATALOG>
<CD>
<TITLE>Empire
Burlesque</TITLE>
<ARTIST>Bob Dylan</ARTIST>
<COUNTRY>USA</COUNTRY>
XML is particularly suitable for sending
documents across the Web.
 XML is a markup languages just like HTML and
allow one to write some content and provide
information about what role that content plays

RDF
The Resource Description Framework or RDF is
a framework that enables the interchange and
description of metadata. RDF is a data
modelling language See:
http://www.w3.org/RDF/
 It allows modelling information through a
variety of syntax formats and enables us to
classify data on the web
 Relationships


<?xml version="1.0"?> <rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdfsyntax-ns#"
xmlns:cd="http://www.recshop.fake/cd#">
<rdf:Description
rdf:about="http://www.recshop.fake/cd/Empire
Burlesque"> <cd:artist>Bob Dylan</cd:artist>
<cd:country>USA</cd:country>
<cd:company>Columbia</cd:company>
<cd:price>10.90</cd:price>
<cd:year>1985</cd:year> </rdf:Description>
RDF SCHEMA
The RDF schema is a knowledge representation
language and it is used to describe ontologies
 Schema defines the vocabulary used in RDF
data models.
 In RDFS we can:

 define
the vocabulary, specify which properties
apply to which kinds of objects
 and what values they can take, and describe the
relationships between objects
ONTOLOGY
“the study of the nature of being”.
 It is about grouping entities and relate them in
a hierarchy, subdividing them by their
similarities and differences

Male
Female
Human Being
student
John
Teacher
Steve
Mark
LOGIC AND PROOF
AI reasoning
 Decision & Deductions take place

TRUST

At this point systems need to gain the user
trust and confidence

a validation of evidence and facts

Explanation Facilities
WHEN WE PRODUCE A DOCUMENT
WE NEED TO ASSOCIATE
ANNOTATIONS
Annotations
•Tag
•Triple RDF
•Metadata
Thanks