OMO: roots endpoint returns empty set, classes page 404

[jvendetti]

I recently added the OBO Metadata Ontology to BioPortal as part of our process of keeping the OBO Foundry and BioPortal content in sync.

The log file contains no parsing errors, however the back-end detects no root classes. The following REST call:

http://data.bioontology.org/ontologies/OMO/classes/roots

... returns an empty set.

This results in the typical front-end issue where attempting to navigate to the Classes tab results in a 404 error.