I recently wrote a paper with Robert Neches who used to be my boss at the Information Sciences Institute (ISI). When I work with...

Best practices for creating and using individuals as test data for OWL ontologies

A common problem that Protégé users encounter when they start working with large ontologies is running out of memory, which results in an...

In a previous blog post I discussed the difference between user supplied names for IRIs and UUIDs. I want to share a tip that Jim Balhoff...

Use SPARQL to convert user supplied IRI names to UUIDs

A paper on the CODO knowledge graph that captures epidemiological and contact tracing data about the Covid-19 pandemic.

I'm working on an article where I provide an overview of the various semantic web technologies such as OWL, SWRL, SPARQL, and SHACL. As...

New version of the Pizza Tutorial for Protégé. Consistent with latest Protégé UI and new sections for SWRL, SPARQL, and SHACL.

This post shows how to use SPARQL to take user defined names in IRIs and use them to fill in the rdfs:label with an appropriately...

Presentations from the Semtech 2021 Semantic Web workshop held at the Indian Statistical Institute.

Simple Web Ontology Language (OWL) vocabulary for measurements in units. Uses SWRL to compute orders and to transform units.

In Protégé and OWL an entity name can refer to the last part of the IRI or the label

CODO is an ontology to provide semantics to data on the Covid-19 pandemic

This explains the difference between using the Drools buttons at the bottom of the SWRLTab and using Pellet and why Pellet is usually better

Collection of blog posts that describe best practices and tips for new users of Protege, OWL, and SWRL

How to implement N-ary relations with additional classes in OWL

Describes a design pattern for representing qualitative values (e.g., low, medium, high) as an enumerated class and transitive properties

Overview of the theory behind OWL as well as how OWL relates to other CS paradigms such as OOP and relational DBs

How to save reasoner inferences in an OWL file

How to remove ontology prefixes for the base ontology from SWRL rules