Thanks @mzient for the first draft, a couple of comments
Looking forward to the first meeting.
@gramalingam I think that the '_' is not supported, instead you have to not set dim_value or dim_param
Historical Notes: The following extensions were considered early on, but were never implemented or supported.
The use of an empty string (as a dimension variable) to denote an unknown dimension not related to any other dimension. This was discarded in favor of using a Dimension with neither dim_value nor dim_param set.
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