def namespaces ns = "root", cn = "__Namespace"
    result = []
    each_instance( ns, cn ) do |inst|
      name = "#{ns}/#{inst.Name}"
      result << name
      result.concat namespaces name, cn
    end
    result.uniq
  end
def namespaces ns = "root", cn = "__Namespace"
    result = []
    each_instance( ns, cn ) do |inst|
      name = "#{ns}/#{inst.Name}"
      result << name
      result.concat namespaces name, cn
    end
    result.uniq
  end
return list of namespaces