Hello,

I have been looking at the Finite Element based CF proposal for Unstructured 
Grid data model 
(https://publicwiki.deltares.nl/display/NETCDF/Finite+Element+based+CF+proposal+for+Unstructured+Grid+data+model)
 which was written up some time ago by Bert.  This proposes an encoding for the 
information required for a consistent spatial interpretation of the values.

Given that UGRID is going to be incorporated into CF _[1]_, I was looking at 
this with to see if backward incompatible changes could occur if this new 
proposal (or something like it) become part of UGRID at a later date.

_[1] it seems like this will indeed happen, once the management side is sorted 
out ..._

My conclusion from a quick read of Bert's document was that adding the 
"Function Space" capability, would not impact on files encoded using UGRID 1.0 
- which would be good. However, the proposal does suggest renaming certain 
special attributes (e.g.  `face_node_connectivity` becomes 
`element_vertex_connectivity`). This could be bad for CF backwards 
compatibility, but, I presume, is easily avoided with a little thought at this 
stage.

Does all this sound like a a reasonable assessment?

Thanks,
David

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