From W3C Wiki

One of the goals of the task force is to develop a minimal information model for drug interaction evidence and knowledge as part of an HIT standard like HL7. The task force is volunteer-based, and formed within the Health Care and Life Sciences Interest Group that operates publicly through the World Wide Web Consortium (W3C).

Documents, meeting information, and announcements for this task force are managed at this Google Site page: https://sites.google.com/site/ddikrandir/home/ddi_info_model_taskforce