Dear @JonathanGregory 

I like "domain topology". (I'll carry on using ?? below so as not to normailise 
yet)

> I suggest that the penultimate paragraph should begin, "A domain that has no 
> ?? topology construct, including domains with more than one domain axis 
> construct"

I don't think that's right. A domain has as many ?? topologies as there are 
domain axis subset combinations. For example, a domain with three domain axes 
has  six ?? topologies. The three that apply to two or more domain axes are 
always implicit, and each of the three that apply to only one domain axis is 
either implicit or else is explicity provided with a ?? topology construct. 

A common case will be a domain with two domain axes - one for time and one for 
UGRID cells - but  there can still be a ?? topology for the UGRID axis.

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