Protocol for Web Description Resources (POWDER): Grouping of Resources W3C Recommendation 1 September 2009 This versionhttp://www.w3.org/TR/2009/REC-powder-grouping-20090901/ Latest versionhttp://www.w3.org/TR/powder-grouping/ Previous versionhttp://www.w3.org/TR/2009/PR-powder-grouping-20090604/ Editors: Phil Archer, Institute of Informatics & Telecommunications (IIT), NCSR "Demokritos" (formerly