The PORTAL-DOORS Project (PDP) for semantic computing on the web and grid began in 2006 with the goal of implementing a cyberinfrastructure system capable of effective data integration, communication and interoperability across different specialty domains in the health care and life sciences.  The initial design paper DOORS to the Semantic Web and Grid with a PORTAL for Biomedical Computing was submitted in 2006, published by IEEE TITB online in 2007 and hardcopy print in 2008. 

The PORTAL-DOORS System (PDS) enables storage, management, and distribution of who what where metadata useful for identifying, describing, locating and linking things on the internet, web and grid.  The most up-to-date paper on PDS, entitled A Distributed Infrastructure for Metadata about Metadata: The HDMM Architectural Style and PORTAL-DOORS System, was published June 1 online in the journal Future Internet.