Most of NML is solid, and has been discussed and tested long enough that I see no problems in pushing it as a standard.

However, there are still some features, which I consider useful but still experimental in the sense that they have not 
been thoroughly discussed.

Proposal 1: We identify these features, and mark them as "EXPERIMENTAL", meaning that they MUST be accepted as 
syntactically valid NML, but MAY be ignored and are NOT RECOMMENDED for use in production services.

Proposal 2: We describe these features in an extension document, rather than in the base document.

Proposal 3: It concerns the following features:
  - artf6512: isParallelCompound
  - artf6579: LinkGroups allowed in <Link> isSerialCompoundLink <Ordered List of (Link|LinkGroup)s>
  - artf6507: hasChannel
  - artf6569 (bullet 7): PortGroup --hasService--> AdaptationService
  - artf6571: source/destination labels
  - artf6580: Allow Node|Topology --(isSource|isSink)--> Link