Description of a system developed using Retrieval Augmented Generation (RAG) and a knowledge graph as a portal for Climate Obstruction researchers

Describes SPARQL queries to separate TBox entities from ABox.

Describes developing a query to delete objects that have different IRIs but are essentially duplicates.

The DaanMatch project and how knowledge graphs and NLP were used to facilitate linking NGOs with the UN Sustainable Development Goals

Examples of using the Web Ontology Language to rigorously define theories in the social sciences

Note: There was a problem with the link to the PDF for the tutorial below. It worked for me because I owned the file but for others since...

Describes ways to use the Simple Knowledge Organization System (SKOS) to define mappings from one Concept Scheme to another.

When you load an ontology from Desktop Protégé to Web Protégé defaults related to IRIs aren't what you would expect. Tells how to set them.

Case study of how Cellfie and SPARQL can automate developing an ontology to model the UN Sustainable Development Goals.

Discusses the pros and cons of property graphs (Neo4J and Cypher) contrasted with the Semantic Web stack: RDF, OWL, SPARQL, SHACL, SWRL

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

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.

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

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