A couple of brief comments.
Scope should include use of open standards to enable machine-to-machine interoperability with other web services and applications. This is, in my view, one of the most important aims of the work, with some of the greatest potential benefits.
The group NEEDS to address and inform the production of census data and metadata. Production should be carried out with a clear view of dissemination in order to achieve a coherent process. We're discovering that some of the 2001 outputs, particularly counts of households with particular combinations of persons (see table CAS 118, for example), are proving very difficult to fit into a hypercube model. If output production isn't informed by dissemination, we risk trying to fit square pegs into round holes all over again.