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Introduction to Resource Description Framework RDF

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Title: Introduction to Resource Description Framework RDF


1
Introduction to Resource Description Framework
(RDF)
2
Outline
  • Metadata Review
  • RDF Basics
  • Basic RDF Data Model
  • Basic RDF Syntax

3
Metadata Review
  • Metadata Structured data about data
  • Improve information discovery and access
  • Applications of Web Metadata
  • Standards about semantics, syntax, and structure
    are required to exchange metadata
  • Semantics defined by resource description
    communities
  • Syntax systematic arrangement of metadata for
    machine-processing
  • Structure formal constraint on the syntax for
    the consistent representation of semantics

4
What is RDF?
  • Resource Description Framework
  • Developed by W3C
  • A new standard for Web metadata
  • Foundation for processing metadata
  • Provide interoperability between applications
    that exchange metadata on the Web
  • Facilitate automated processing of Web
    information
  • Define a mechanism for describing resources that
    makes no assumptions about a particular
    application domain

5
What is RDF ? (Cont.)
  • Resource Description Framework
  • An infrastructure that enables the encoding,
    exchange, and reuse of structured metadata
  • Support common conventions (standards) of
    semantics, syntax, and structure
  • A structured syntax to define metadata elements
    (vocabularies)
  • Use XML as a common syntax
  • Impose structure that provides for the
    unambiguous expression of semantics

6
Related Works
  • HTML ltMETAgt and ltLINKgt tags
  • Platform for Internet Content Selection (PICS)
  • Content Rating
  • Introduce the notion of machine-interpretable
    schemata for metadata
  • PIC-NG RDFs predecessor
  • SGML, XML
  • Knowledge representation community,
    OO-programming and modeling languages, databases

7
Basic RDF Data Model
8
RDF Data Model
  • A model for describing
  • resources
  • named properties
  • property values

9
Resource
  • Any object that is uniquely identifiable by an
    Uniform Resource Identifier (URI) plus optional
    anchor ids
  • An entire Web page
  • Part of a Web page
  • An object not directly accessible via the Web
    (e.g. a printed book)

10
Property
  • A specific aspect, characteristics, attribute, or
    relation used to describe a resource
  • Specific meaning
  • Permitted values
  • Types of resources it can describe
  • Relationship with other properties
  • RDF Schema specification

11
Statement
  • A specific resource together with a named
    property plus the value of that property for that
    resource
  • Subject Resource
  • Predicate Property
  • Object Property value
  • Literal or another resource
  • Description A collection of the properties that
    refers to the same resourc

12
Generic RDF Description
13
Example 1
  • Ora Lassila is the creator of the resource
    http//www.w3.org/Home/Lassila
  • Property http//www.w3.org/Home/Lassila
  • Predicate Creator
  • Object "Ora Lassila
  • ltSubjectgt HAS ltPredicategt ltObjectgt

14
Example II and III
  • The individual whose name is Ora Lassila, email
    ltlassila_at_w3.orggt, is the creator of
    http//www.w3.org/Home/Lassila
  • Diagram
  • The individual referred to by employee id 85740
    is named Ora Lassila and has the email address
    ltlassila_at_w3.orggt. The resource http//www.w3.org/H
    ome/Lassila was created by this individual
  • Diagram

15
Example II -- Diagram
16
Example III -- Diagram
17
Basic RDF Syntax
18
Introduction
  • The RDF data model provides an abstract,
    conceptual framework for defining and using
    metadata.
  • A concrete syntax is also needed for the purposes
    of creating and exchanging this metadata.
  • XML
  • Alternate syntaxes, like S-expression, are also
    possible

19
Application of Web Metadata
  • Cataloging
  • Software agents and resource discovery
  • Electronic Commerce
  • Content Rating
  • Intellectual Property Rights
  • Digital Signatures
  • Privacy
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