This approach requires that inputs are provided as lists, even if
only one representation will be created. Should we allow a single value as
well as a list of values?
[Calin] This is as we see fit, not a problem. If a node is
supposed to have one “occurrence” in a topology template (which for
the majority will do), then we use the single value input. If the
occurrences are more, then we use lists.
These comment items were contained in csd06 section 14.2 and moved here as part of https://github.com/oasis-tcs/tosca-specs/issues/61