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[bioontology-support] NDDF Ontology

Ray Fergerson rayferg at
Fri Oct 9 17:43:06 PDT 2015

This ontology is modeled as "flat", meaning that there is not much hierarchy. It is essentially a bag of terms. Thus the only way to "navigate" is to search for a term.


From: bioontology-support [mailto:bioontology-support-bounces at] On Behalf Of Hari, Sekhar
Sent: Monday, October 5, 2015 3:44 AM
To: support at
Subject: [bioontology-support] NDDF Ontology
Importance: High

Hello there -

In the  NCBO BioPortal web site, I am unable to view the source vocabularies for National Drug Data File (NDDF) ontology. The following link shows no vocabularies :

Can you please look into this matter, and as soon as possible as I am trying to download the NDC ontology into I2B2?

Sekhar H.
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