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Protege: How To Define Classes as Property Restrictions

This video is about defining new classes by leveraging the property restrictions of existing classes. This is demonstrated with Protégé, a free, open-source ontology editor [...]

By |January 10th, 2017|Comments Off on Protege: How To Define Classes as Property Restrictions

Protege: How To Define Class Axioms

This video is about defining class axioms using Protégé, a free, open-source ontology editor and framework. Although the video deals with one specific tool, it [...]

By |January 10th, 2017|Comments Off on Protege: How To Define Class Axioms

From a Wikipedia Page to the Corresponding DBpedia Page in One Click

This blog post contains a "scriplet" (i.e., a little bit of JavaScript code embedded in a link) which, if placed in a Web browser's "bookmarks" [...]

By |January 9th, 2017|Comments Off on From a Wikipedia Page to the Corresponding DBpedia Page in One Click

How Is SPARQL Different From SQL?

This video explains how the SPARQL query language differs from SQL. Highlighted is the ability of SPARQL to handle complex joins that would be too [...]

By |January 8th, 2017|Comments Off on How Is SPARQL Different From SQL?

Databases: Graph vs. Relational

This video describes the differences between graph database models (such as RDF) and relational models (RDBMS). The narrator gives examples of when it would be [...]

By |January 8th, 2017|Comments Off on Databases: Graph vs. Relational

How Does a Graph Database Differ From a Relational Database?

This video describes the difference between a graph database model (such as RDF) and the relational database model (RDBMS). Focuses on the increased efficiency of [...]

By |January 8th, 2017|Comments Off on How Does a Graph Database Differ From a Relational Database?

Ontologies and the Semantic Web

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 [...]

By |December 29th, 2016|Comments Off on Ontologies and the Semantic Web

Using Ordnance Survey Linked Data: A Python RDFLib Example

The author describes how he created a mashup of data.gov.uk and Ordnance Survey Linked Data using just the Python RDFLib library - no triple store [...]

By |December 28th, 2016|Comments Off on Using Ordnance Survey Linked Data: A Python RDFLib Example

Permanent Identifiers and Vocabulary Publication: purl.org and w3id

This blog post addresses concerns with the stability of purl for hosting permanent URIs. As a possible alternative, the author presents w3id.org, an effort launched [...]

By |December 21st, 2016|Comments Off on Permanent Identifiers and Vocabulary Publication: purl.org and w3id

Towards a Human Readable Maintainable Ontology Documentation

Ontology documentation is critical to support reuse, as it provides an overview of the terms of the ontology with examples, diagrams and their definitions. In [...]

By |December 21st, 2016|Comments Off on Towards a Human Readable Maintainable Ontology Documentation