Eliminating ncbitaxon:root and instead bridging to true organism subclasses #211
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please read closely and read the related issue before commenting
This PR removed the statement that COB:organism = NCBITaxon:root
Rationale: root includes non-organisms such as samples
See obophenotype/ncbitaxon#10
This PR replaces that link with two subClassOf axioms
Note that if this were merged, then the union of NCBITaxon and COB would have a lattice at the top. However, it would be trivial to add NCBITaxon:1 to an anti-slim and filter it out, resulting in a tree with COB:organism as the single MRCA of all organism classes
Merging this PR has some advantages such as obviating the need to rename NCBITaxon:1, since we instead simply inject our own true parent. It leaves the structure of labeling of NCBITaxon intact
Important please refrain from discussing the definition of organism here, specifically whether it includes viruses. For COB purposes, this is a closed issue. See: #6