A subclass of B A instance of 'type of B' B subclass of 'C' B instance of 'type of C' C subclass of 'D' C instance of 'type of D'
It's a bit more subtle than that, as, let's take the Taxonomy example, and take the <animal> class. Old classifications used to take <fish> as a taxon. It is proved right now that fish is not a clade. It's still a subclass of <animal> though. I claim <fish> subclass of <animal> is still correct. <fish> is an old taxon. But <fish> instance of <clade> is not true. If someone want to search for direct subclasses of "animal", he would still have "fish" as a result, maybe. Although if he is interested in clades only my approach works, and he would get a closer approximation of what modern taxonomy tree is.
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