Sorry - this is more complicated than I first thought! The clarification needs
to be redesigned, which I shall do shortly.
The issue I've realised is that we need to allow auxiliary coordinates and
other related variables to span a subset of the compressed axes, but not be
compressed themselves. In the following example, this would be the case for a
1-d auxiliary coordinate `aux_var` that spans the `lat` dimension:
```
dimensions:
lat=73;
lon=96;
landpoint=2381;
depth=4;
variables:
int landpoint(landpoint);
landpoint:compress="lat lon";
float landsoilt(depth,landpoint);
landsoilt:long_name="soil temperature";
landsoilt:units="K";
landsoilt:coordinates="soil_type aux_var";
float depth(depth);
float lat(lat);
float lon(lon);
int soil_type(landpoint);
soil_type:long_name="integer code defining the soil type";
float aux_var(lat);
```
If this is allowed, then it would be the conformance document that is wrong,
rather than the conventions document, as we are allowing the related variable
to span a dimension (`lat`) that is not explicitly spanned by the data variable
(which spans `depth` and `landpoint`).
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