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[bioontology-support] Empty classes at API class request

Erik Fäßler erik.faessler at
Mon Aug 10 01:24:44 PDT 2015

Dear BioPortal team,

When downloading all classes of NCIT, I noticed a range of classes that seem to be empty. They have an ID in the form <>

But no other information whatsoever. They do serve as parents to other, nonempty, classes, however. I searched for information on the web but did not have any luck. I apologize if I just missed the respective documentation page.
The IRIs do not look as being part of the actual ontology/terminology. Where do they come from and what is their meaning?

Thank you very much,

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