Taxonomic hierarchy in SDD

[Steve at]

Sounds fine, store the hierarchy but keep it separate from the items.  No
worries.  The idea of supporting multiple hierarchies for different
inheritances is interesting and I can see its potential importance.  I'll
need to test it out here in "biology land" to see if it makes sense in
practice.

I believe that the classification is tied very closely to taxon concepts,
and that descriptions are certainly tied to concepts. If you change the
concept you almost always change the description, and so knowing the
classification can be important in understanding what the author is up to.

Steve