[Nml-wg] encoding for Switching Service

Hi, Richard has performed a thorough review of our document, and an interesting question came up: Why does a Switching Service not have an encoding attribute? We have an encoding attribute for Ports and Links, including Links created by a Switching Service. So why not also include it in the Switching Service itself? I thought there was an issue on the tracker on this, but I can't find anything. Do we see any problem with this? Jeroen.