The "Web Description Resources Datatypes (WDRD)" document at
http://www.w3.org/TR/2007/WD-powder-xsd-20070925/
says:
[[
This is the namespace document for the XML schema used in the Protocol
for Web Description resources (POWDER). It defines the datatypes used
and the structure for Description Resources where these are serialized
in XML.
]]
Does this mean that there will be a specialized (non-RDF/XML) XML syntax
for serializing POWDER? If so, will it have a GRDDL annotation for
automatic transformation to RDF?