Dear David It's a good point that there may be domain axes which aren't involved in the topology. Thanks for the correction. We can supply a ?? topology construct provided it refers to a single domain axis (the UGRID case). I'm not sure there would be more than topology for a domain, although I agree it's conceivable, but I think that's in the realm of speculation, since we don't currently have a use-case for describing the situation with more than one domain axis involved in the topology.
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