internal static Representation Create(INakedObjectSpecificationSurface[] specs, HttpRequestMessage req, RestControlFlags flags) {
// filter out System types
specs = specs.Where(s => !s.FullName().StartsWith("System.") && !s.FullName().StartsWith("Microsoft.")).ToArray();
// filter out predefined types
specs = specs.Where(s => !RestUtils.IsPredefined(s)).ToArray();
return new ListRepresentation(specs, req, flags);
}