-DARSHINI PARIKH

(TechKnowXpress)

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WHAT IS SEMANTIC

WEB?

The Semantic Web is an extension of the Web through standards by the World Wide Web Consortium (W3C)

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ADVANTAGES OF SEMANTIC

WEB OVER TRADITIONAL

WEB

Improve the understandability and interpretability of data for processing by machines

Enables inference of new knowledge from existing information

Integration of heterogeneous data

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SEMANTIC WEB

TECHNOLOGY STACK

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BUILDING BLOCKS OF SEMANTIC

WEB

RDF –Resource Description Framework

ONTOLOGIES

SPARQL

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RESOURCE DESCRIPTION FRAMEWORK

(RDF)

Standard model for data interchange on the Web.

Facilitates data merging even if the underlying schemas differ.

Supports the evolution of schemas over time without requiring all the data consumers to be changed.

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RESOURCE DESCRIPTION FRAMEWORK

(RDF) (conti…)

RDF extends the linking structure of the Web to use URIs to name the relationship between things as well as the two ends of the link.

Allows structured and semi-structured data to be mixed, exposed, and shared across different applications.

RDF Triple:Rdf: subject.Rdf: predicate.Rdf: object.

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RESOURCE DESCRIPTION FRAMEWORK

SCHEMA(RDFS)

RDFS is a set of classes with certain properties using the RDF extensible knowledge representation data model, providing basic elements for the description of ontologies

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ONTOLOGIES

An ontology is a formal specification of a shared conceptualization

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TYPES OF ONTOLOGIES DOMAIN

ONTOLOGY

TASK ONTOLOGY

APPLICATIONONTOLOGY

TOP LEVEL ONTOLOGY

The ontology which describes very general concepts across all knowledge domains is called top level ontology

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TYPES OF ONTOLOGIES

(conti…)

DOMAIN ONTOLOGY

TASK ONTOLOGY

APPLICATIONONTOLOGY

TOP LEVEL ONTOLOGY

The ontology which provides a specification or detailed description of elements and relationships of tasks to explain how tasks can exist and be used in a specific field or environment.

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TYPES OF ONTOLOGIES

(conti…)

DOMAIN ONTOLOGY

TASK ONTOLOGY

APPLICATIONONTOLOGY

TOP LEVEL ONTOLOGY

The ontology which represents concepts belonging to part of the world is called domain ontology

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TYPES OF ONTOLOGIES

(conti…)

DOMAIN ONTOLOGY

TASK ONTOLOGY

APPLICATIONONTOLOGY

TOP LEVEL ONTOLOGY

The ontology which is engineered for a specific use or application focus and whose scope is specified through testable use cases is called application ontology

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SPARQL

SPARQL Protocol

And RDF Query

Language

SPARQL is an RDF query language

SPARQL allows for a query to consist of triple patterns, conjunctions, disjunctions and optional patterns

SPARQL is able to retrieve and manipulate data stored in Resource Description Framework (RDF) format

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OWL –WEB ONTOLOGY LANGUAGE

The Web Ontology Language (OWL) is a family of knowledge representation languages for authoring ontologies.

OWL exists in various flavors: OWL EL

OWL RL

OWL QL

OWL2 DL

OWL2 Full

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USE OF OWL

WEB PORTALS

Content-based searches for non-text media

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USE OF OWL

(conti…)

MULTIMEDIA COLLECTIONS

Categorization rules used to enhance search

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USE OF OWL

(conti…)

CORPORATE WEB SITE MANAGEMENT

(1) Automated Taxonomical Organization of data and documents(2) Mapping Between Corporate Sectors (mergers!)

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USE OF OWL

(conti…)

DESIGN DOCUMENTATION

(1) Explication of derived assemblies

(2) Explicit Management of Constraints

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USE OF OWL

(conti…)

INTELLIGENT AGENTS

(1) Expressing User Preferences and/or Interests(2) Content Mapping between Web sites

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USE OF OWL

(conti…)

WEB SERVICES AND UBIQUITOUS COMPUTING

(1) Web Service Discovery and Composition(2) Rights Management and Access Control

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GIST

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