Understands the principles and practice of inferencing. – Linked Data for Professional Education

RDF Homework Exercises

Sat, 21 Jan 2017 06:46:41 +0000

This document contains several "written" and "electronic" homework questions originally from the course "Semantic Web Topics" at LeHigh University. They include: Translating an RDF Graph into the Turtle syntax; Using the RDFS entailment rules determine what triples can be inferred from an RDF Graph; Explain the advantage of using multiple rdfs:range statements over using the union of the individual ranges to determine the actual range; Draw the equivalent graph when given an RDF document written in XML; Write the equivalent RDF/XML for a series of online references; Using Jena, write a class object that can read in an RDF file that was written using a specific vocabulary and output a list of the publications, one per line.

URL: http://www.cse.lehigh.edu/~heflin/courses/sw-2013/hw1.pdf
Keywords: Turtle, RDF Schema, Entailment regimes, eXtensible Markup Language (XML), Apache Jena, Java
Author: Heflin, Jeff
Date created: 2013-02-01 05:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P4H
Educational use: assessment
Educational audience: teacher-educationSpecialist
Interactivity type: active

OWL and DL Homework Exercises

Sat, 21 Jan 2017 06:46:41 +0000

This document contains several "written" and "electronic" homework questions originally from the course "Semantic Web Topics" at LeHigh University. They include: Draw the equivalent graph given an OWL document expressed in RDF syntax; In the OWL RDF/XML-based syntax, write two different axioms (i.e., using a different combination of constructors) stating that the classes Man and Woman are disjoint- without using owl:disjointWith; Given a sets of triples in Turtle syntax which describes several resources, write a set of OWL2 axioms that would allow one to infer several properties about each resource; For each of a series of axioms, determine which of three possible interpretations satisfy it.

URL: http://www.cse.lehigh.edu/~heflin/courses/sw-2013/hw3.pdf
Keywords: Web Ontology Language (OWL), Axioms, Disjointedness, RDF Schema, Description Logic (DL)
Author: Heflin, Jeff
Date created: 2013-02-01 05:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P2H
Educational use: assessment
Educational audience: teacher-educationSpecialist
Interactivity type: active

SPARQL and Linked Data Homework Exercises

Sat, 21 Jan 2017 06:46:40 +0000

This document contains several "written" and "electronic" homework questions originally from the course "Semantic Web Topics" at LeHigh University. They include: Write a series of SPARQL queries using a provided schema; Write a SPARQL construct query that generates all triples inferred by a specific RDFS entailment rule; Write a SPARQL construct query to generate
owl:sameAs statements between domains which share specified property; Describe the pros and cons of generating links in the manner specified in the previous question; Using Jena, create a class that can read in all the files in a specified directory and create a Web page that lists a series of publications organized by topic – reading all of the files into a single model and only using SPARQL to retrieve information from the model.

URL: http://www.cse.lehigh.edu/~heflin/courses/sw-2013/hw2.pdf
Keywords: SPARQL, RDF Schema, Entailment regime, Apache Jena, Java
Author: Heflin, Jeff
Date created: 2013-02-01 05:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P4H
Educational use: assessment
Educational audience: teacher-educationSpecialist
Interactivity type: active

Design an OWL Ontology Project

Sat, 21 Jan 2017 06:46:40 +0000

This document outlines a project originally from the course "Semantic Web Topics" at LeHigh University. Students are asked to work in teams to design an OWL 2 DL ontology (or set of ontologies) for an application domain of their choice – ideally, this domain should be one they know about. Since students are also expected to create a set of instances that demonstrate the use of the ontology, they should also choose a domain that has data they can access. Ontologies must be valid OWL or OWL 2 DL ontologies and should use the rich modeling constructs of OWL as much as possible. A DL reasoner should be used to ensure that classes are satisfiable and that the ontology does not lead to unintended inferences.

URL: http://www.cse.lehigh.edu/~heflin/courses/sw-2013/project1.pdf
Keywords: Web Ontology Language (OWL), RDF Schema, Description Logic (DL)
Author: Heflin, Jeff
Date created: 2013-02-01 05:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P4H
Educational use: assessment
Educational audience: teacher-educationSpecialist
Interactivity type: active

Ontologies and the Semantic Web

Fri, 30 Dec 2016 06:44:09 +0000

A video lecture introducing RDF Schema and OWL, with visible slides throughout. The concepts behind ontologies are also discussed in a general, schema-agnostic manner. Places these technologies within the larger context of the Semantic Web.

URL: http://videolectures.net/koml04_harmelen_o/
Keywords: Ontology, Semantic Web, Web Ontology Language (OWL), RDF Schema
Author: van Harmelen, Frank
Date created: 2007-02-25 05:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P1H
Educational use: instruction
Educational audience: student
Interactivity type: expositive

Querying Linked Data

Fri, 21 Oct 2016 05:39:20 +0000

This module looks in great detail at SPARQL and introduces approaches for querying and updating semantic data. It covers the SPARQL algebra, the SPARQL 1.1 protocol, and provides examples for reasoning over Linked Data. The module uses examples from the music domain, which can be directly tried out and ran over the MusicBrainz dataset. This includes gaining familiarity with the RDFS and OWL languages, which allow developers to formulate generic and conceptual knowledge that can be exploited by automatic reasoning services in order to enhance the power of querying.

URL: http://www.euclid-project.eu/modules/chapter2.html
Keywords: Inferencing, SPARQL, RDF Schema, Web Ontology Language (OWL), Semantic Web, Entailment
Author: Norton, Barry
Publisher: EUCLID Project
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P3H
Educational use: professionalDevelopment
Educational audience: professional
Interactivity type: expositive

On the Semantics of SPARQL Queries with Optional Matching under Entailment Regimes

Sat, 16 Jan 2016 13:43:29 +0000

This presentation covers the semantics of SPARQL queries with optional matching features under entailment regimes. It argues that normative semantics may lead to answers that are in conflict with the intuitive meaning of optional matching, where unbound variables naturally represent unknown information. The presenters propose an extension of the SPARQL algebra that addresses these issues and is compatible with any entailment regime satisfying the minimal requirements given in the normative specification. They argue that this solution comes at no cost for regimes with an entailment relation of reasonable complexity and that it preserves the known properties of optional matching that are commonly exploited for static analysis and optimization.

URL: http://videolectures.net/iswc2014_kostylev_sparql_queries/
Keywords: Entailment regimes, Unbound variable, Normative semantics, Web Ontology Language (OWL), Strict semantics
Author: Kostylev, Egor
Date created: 2014-12-19 05:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P15M

Answering SPARQL Queries over Databases under OWL 2 QL Entailment Regime

Sat, 16 Jan 2016 13:43:29 +0000

This video presents an extension of the ontology-based data access platform Ontop that supports answering SPARQL queries under the OWL 2 QL direct semantics entailment regime for data instances stored in relational databases. On the theoretical side, we show how any input SPARQL query, OWL 2 QL ontology and R2RML mappings can be rewritten to an equivalent SQL query solely over the data. On the practical side, we present initial experimental results demonstrating that by applying Ontop technologies the system produces scalable SQL queries.

URL: http://videolectures.net/iswc2014_kontchakov_sparql_queries/
Keywords: Ontop, Entailment Regimes, Ontology-Based Data Access (ODBA), Query rewriting, RDBMS, Relational model
Author: Kontchakov, Roman
Date created: 2014-12-19 05:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P20M

Creating and Using Ontologies

Sat, 16 Jan 2016 13:43:29 +0000

Discussion of what ontologies are (and are not) and how to build them in two primary stages: 1) Requirements analysis and 2) Conceptualization. Each primary stage is broken down into sub- stages in which detailed concerns (e.g., domain and range, classes and properties, use of existing vocabularies) is considered. Good amount of discussion on how ontology relates to Linked Data with lots of examples.

URL: http://videolectures.net/eswc2012_simperl_ontologies/
Keywords: Range, Domain, Properties, Classes, Vocabulary, Ontology, Linked Data, Semantic Web
Author: Simperl, Elena
Publisher: Karlsruhe Institute of Technology
Date created: 2012-07-04 04:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P1H45M

Ontologies and Databases

Sat, 16 Jan 2016 13:43:29 +0000

Briefly discusses what an ontology is before focusing on querying a database via an ontology. Fairly dismissive of the Semantic Web as a pipe dream- but the description of how ontologies work in practice (in the context of querying a database) may be quite useful to those who have only been lectured on the topic of ontologies in an abstract, theoretical manner.

URL: http://videolectures.net/eswc2012_franconi_ontologies_databases/
Keywords: Entity-Relationship Schema, Unified Modeling Language (UML), Ontology, Constraints
Author: Franconi, Enrico
Publisher: Research Centre for Knowledge and Data (KRDB)
Date created: 2012-07-04 04:00:00.000
Language: http://id.loc.gov/vocabulary/iso639-2/eng
Time required: P1H10M
Educational use: instruction
Educational audience: professional
Interactivity type: expositive