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[bioontology-support] How a tree is determined from a DAG?

Jennifer Leigh Vendetti vendetti at
Mon Nov 12 12:35:39 PST 2018

Hello Michael,

Apologies, but I’m not sure I understand what you’re looking for.

BioPortal accepts ontologies in a handful of different formats. We use a tree to depict the class structure. The properties used to display the tree structure depend on the ontology format. subClassOf is used for OWL ontologies, “broader" for SKOS vocabularies, and “part_of”, “contains”, and “develops from” for OBO ontologies.

The class you mention below appears in two places in the tree because it has two subClassOf declarations in the ontology source file.

Kind regards,

> On Nov 10, 2018, at 7:51 PM, Michael Liu <megapode32559 at> wrote:
> Hi,
> I see some class has more than one superclasses, which means that the
> class hierarchy should be a directed acyclic graph (DAG) instead of a
> tree. But the panel on the left shows a tree structure. Is there tree
> draw by using only the first subClassOf property of each class?
> Thanks.
> -- 
> Best wishes,
> Michael
> _______________________________________________
> bioontology-support mailing list
> bioontology-support at

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