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Apologies, I was looking at an older version of bibframe.rdf (from mid-2016). The current version (2017-02) has subclass of owl:Thing. -- Darren On 5/2/17 4:51 PM, Darren Weber wrote: > This is a handy graphical representation of common practice for OWL > ontologies: > > - > https://www.infowebml.ws/rdf-owl/graphical-representations.htm#rdfsClass > > Almost everything in BF2 is a subclass of rdfs:Resource. In other > words, BF2 classes "sidestep" owl:Thing (for almost everything except > bf:Agent) to assert subclass relations directly on rdfs:Resource. As > this seems, to me, to be an unusual practice for an ontology (OWL > ontology), I'd like to understand the reasoning behind it. (When > developing MADSRDF, the root class is owl:Thing, so this seems to be a > departure from another LC ontology practice.) > > Thanks, > Darren > > -- Darren L. Weber, Ph.D. Cognitive Scientist and Software Engineer Digital Library Systems and Services Stanford University Libraries Lathrop Library 518 Memorial Way MC:3101 Stanford, CA 94305-3101 http://stanfordwho.stanford.edu/lookup?search=darren%20weber http://www.linkedin.com/in/darrenleeweber http://orcid.org/0000-0002-4822-6661 http://github.com/darrenleeweber http://github.com/sul-dlss