http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
improving P&IDs, supplier data, and packaged units
prepared by the Construction Industry Institute, Piping Function Research Team.
Includes bibliographical references (pages 27-28).
Research summary (University of Texas at Austin. Construction Industry Institute) ; 47-1