def apply_namespace(qname, apply_prefix, apply_uri)
      local_part, prefix, uri = qname
      
      if !prefix
        prefix = apply_prefix
        uri = apply_uri
      end

      [local_part, prefix, uri].compact
    end
def apply_namespace(qname, apply_prefix, apply_uri)
      local_part, prefix, uri = qname
      
      if !prefix
        prefix = apply_prefix
        uri = apply_uri
      end

      [local_part, prefix, uri].compact
    end
given an exploded qname, apply a given namespace and uri if the qname
 has no namespace already