1. Semantic Web Lecture Notes Prepared by Jagdish S. Gangolly
Ph.D Program in Information Science
State University of New York at Albany
9/21/2018
Inf 703, Fall 2003 (Gangolly)

2. Semantic Web
..is a mesh of information linked up in such a way as to be easily processable by machines, on a global scale. (
9/21/2018
Inf 703, Fall 2003 (Gangolly)

3. Motivation
Need for interchangeability of information (information sharing)
Need for interchangeability, translatability, uniformity of ontologies
Need for improving precision in retrieval
Need for web services based on understanding of data as well as metadata
9/21/2018
Inf 703, Fall 2003 (Gangolly)

4. Semantic Web Components
Data
Structure
Content
Format
Ontology
Metadata
Representation Languages
Facility for metadata Interchange
9/21/2018
Inf 703, Fall 2003 (Gangolly)

5. Data Data (Semi-structured as well as structured)
Structure Tags: XML-Schema
Content Tags: XML-Schema
Ontology: Ontology representation languages
9/21/2018
Inf 703, Fall 2003 (Gangolly)

6. Metadata I Representation languages based on First Order Logic
KIF-based Ontolingua (
Loom (
Frame-Logic (
9/21/2018
Inf 703, Fall 2003 (Gangolly)

7. Metadata II Languages using standardised syntax
Simple HTML Ontology Extensions (SHOE) (
XOL Ontology Exchange Language (XOL)(
Ontology Markup Language (OML and CKML) (Ontology Markup Language (OML and CKML)
Resource Description Framework Schema Language (RDFS) (
RiboWEB (
9/21/2018
Inf 703, Fall 2003 (Gangolly)

8. Metadata III
OIL (Ontology Interchange Language) (
DAML+OIL (
XFML+CAMEL (eXchangeable Faceted Metadata Language + Compound term composition Algebraically-Motivated Expression Language) (
Good sources of information:
(These notes based on this source)
9/21/2018
Inf 703, Fall 2003 (Gangolly)

9. Dublin Core Metadata ElementsISO 15836:2003 Title Format Creator
Identifier
Subject
Source
Description
Language
Publisher
Relation
Contributor
Coverage
Date
Rights
Type
9/21/2018
Inf 703, Fall 2003 (Gangolly)

10. RDF (http://www.xml.com/pub/a/2002/01/30/daml1.html)
XML based language that allows you to define classes and properties
<rdfs:Class rdf:ID="Product"> <rdfs:label>Product</rdfs:label> <rdfs:comment>An item sold by Super Sports Inc.</rdfs:comment> </rdfs:Class>
<rdfs:Property rdf:ID="productNumber"> <rdfs:label>Product Number</rdfs:label> <rdfs:domain rdf:resource="#Product"/> <rdfs:range rdf:resource=" </rdfs:Property>
9/21/2018
Inf 703, Fall 2003 (Gangolly)

11. DAML+OIL I (http://www.xml.com/pub/a/2002/01/30/daml1.html)
DAML+OIL also allows you to define instances of classes and specify their properties
<Product rdf:ID="WaterBottle"> <rdfs:label>Water Bottle</rdfs:label> <productNumber>38267</productNumber> </Product>
DAML+OIL allows datatyping
<daml:DatatypeProperty rdf:ID="productNumber"> <rdfs:label>Product Number</rdfs:label> <rdfs:domain rdf:resource="#Product"/> <rdfs:range rdf:resource=" </daml:DatatypeProperty>
9/21/2018
Inf 703, Fall 2003 (Gangolly)

12. DAML+OIL II (http://www.xml.com/pub/a/2002/01/30/daml1.html)
Provides for uniqueness, equivalence, enumerations, disjoint classes, disjoint unions of classes, non-exclusive Boolean combinations of classes, intersection of classes, sub-classing, property restrictions
Rich enough to model ontologies
9/21/2018
Inf 703, Fall 2003 (Gangolly)

13. Web Ontology Language (OWL) I
OWL Lite supports those users primarily needing a classification hierarchy and simple constraints.
OWL DL supports those users who want the maximum expressiveness while retaining computational completeness (all conclusions are guaranteed to be computed) and decidability (all computations will finish in finite time).
OWL Full is meant for users who want maximum expressiveness and the syntactic freedom of RDF with no computational guarantees.
Source:
9/21/2018
Inf 703, Fall 2003 (Gangolly)

14. Web Ontology Language (OWL) II
9/21/2018
Inf 703, Fall 2003 (Gangolly)