Conformance requirements should be added concerning at least what mustSupport means in this IG and which minimal set of queries have to be supported to comply to the IG. A main goal is to support the IHE-RO XRTS use cases and this should drive the requirements. Therefore, requirements could also be defined in IHE-RO XRTS instead of the CodeX RT IG, but I would prefer them to be part of the IG if the working group considers them as applicable for all IG users.