struggling to understand conformance in POWDER formal semantics

I'm puzzled by this...

"Conformance with this document means that Description Resources may be
transformed from POWDER to POWDER-BASE to POWDER-S as set out below
without any change to their semantics. When querying or inferring from
the RDF/OWL graph, conformant implementations of this document will also
implement the semantic extension defined below."

What product classes are being defined here?
I see "conformant implementations" but I don't really see
a definition of the form

  A conforming POWDER implementation is ...

as I'd expect.

I'd also expect to see something about conformance of documents,
though perhaps that's in one of the other documents? In which
case a cross-reference seems in order.

Dan Connolly, W3C
gpg D3C2 887B 0F92 6005 C541  0875 0F91 96DE 6E52 C29E

Received on Monday, 1 December 2008 16:11:18 UTC