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http://www.w3.org/2000/01/rdf-schema#comment
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A classifier allows the user to select the type of an object.
The possible types must be subclasses of some overall class, the "category".
(Ideally, the superclass is also set up as the disjoint union of the subclasses,
if they are disjoint.)
The form normally stores the resulting classes using an rdf:type triple,
but a different predicate can be used if required, so the classifier field
needs is 'property' defined too.
If the subclass selected itself is has subclasses defined, the user can
recursively select from them in turn, as many levels as needed.
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