updated ’08CmpE 583 Fall 2008Introduction- 1 CmpE 583- Web Semantics: Theory and Practice Atilla ELÇİ Computer Engineering Department Eastern Mediterranean University

updated ’08 CmpE 583 Fall 2008 Introduction- 2 Introduction The study of semantic Web has been immensely important due to tremendous increase in Web-based applications, media and publication in general. Students of our degree programs need to be introduced to recent developments, standards and research in this evolving & broad area. Thus, this course aims to introduce and expose the state of affairs in “Web Semantics”.

updated ’08 CmpE 583 Fall 2008 Introduction- 3 Agenda Course description Introduction to “Web Semantics” Succession of topics.

updated ’08 CmpE 583 Fall 2008 Introduction- 4 URI Rule RSS XML OWL WS RDF WWW GRID Course Description Objective:  Define Web Ssemantics  Review semantic Web technology  Break into research areas. Outline: XML, RDF, OWL, WS.  For further detail: Web site at 583 Course Site.

updated ’08 CmpE 583 Fall 2008 Introduction- 5 Introduction to “Web Semantics” WWW content is for human consumption. The Semantic Web:  Encompasses efforts to create mechanisms that augment content with formal semantics, thereby producing content suitable for automated systems (such as intelligent agents) to consume.  Represents a departure from the current "rendering- oriented" Web.  Is an extension of the current WWW and not a separate Web. [Ref.: Nokia-96]  Is for achieving a set of connected applications for data on the Web in such a way as to form a consistant logical web of data. [Ref.: TBL-98]

updated ’08 CmpE 583 Fall 2008 Introduction- 6 Intro to “Web Semantics” (continued) The Semantic Web will allow:  Use of more automated functions on the Web, such as: Knowledge management Reasoning, Service discovery, Service composition, Workflow and process management, Etc. easing the workload of humans.  Ease information handling: Semantic-based discovery, Gathering of context-sensitive info, Situation awareness Presentation: device independence and customization Creation of info with context.

updated ’08 CmpE 583 Fall 2008 Introduction- 7 Intro to “Web Semantics” (continued)  The Semantic Web says, "Let's get the data on the Web with its meaning”.  “This is a whole new general infrastructure”.  In 20 years, “ People will talk about the Web in the same way that they talk about paper. They won't be discussing it as a phenomenon; they will just assume it”. [TBL-2000]

updated ’08 CmpE 583 Fall 2008 Introduction- 8 Semantic Web- Layers of Abstraction Machine-Understandable Information [Ref. TBL-98]  The basic assertion model layer: Resource Description Framework: RDF for Assertions and quotations.  The schema layer: RDF Schema for forms compliance.  Conversion language for doc conversion from one RDF schema to another.  The logical layer: expressing rules of processing. Language for proof: proof validation Inference rules language Query languages  Digital signature  Engines of the future.

updated ’08 CmpE 583 Fall 2008 Introduction- 9 Succession of topics. Terminology: vocabulary of Web semantics Semantic Web principles and practice XML and processing RDF: syntax, query, standards Web ontology: OWL Web rules Web syndication: WS, RSS,... Semantic Grid systems Case studies, and Future directions.

updated ’08 CmpE 583 Fall 2008 Introduction- 10 Vocabulary Glossary of terms Define the terms as used in this subject

updated ’08 CmpE 583 Fall 2008 Introduction- 11 Where to Get More Information [Nokia]  Local copy Local copy [TBL-98] Tim Berners-Lee: The Semantic Web Roadmap, W3C Draft Document, Sep W3C Draft Document [TBL-2000] Newsweek interview with Tim Berners-Lee: The "Semantic Web", in Newsweek, Oct. 30, 2000 issue. The "Semantic Web" WWW Consortium: Semantic Web Services Initiative (SWSI) SemanticWeb.org Elsevier Journal of Web Semantics