I decided to build on my “20 queries” exercise and draft a partial ontology for materials using Protégé, an open-source ontology editor.

Homology deals with substructure similarity. For example, the structures of concern may be gene sequences – structures with clear reification as physical arrangements of atoms.

A scientific database cannot be everything to everyone. Jim Gray came up with the “20 queries” heuristic.

What makes data reliable? A recent article1 outlines five properties. It’s