]> From Gramene's notion of trait categories. Anticpated used is via aggregation: e.g., instantiate an individual trait as both rdf:type trait:Trait and rdf:type trait:Category. Additionally, it may be of rdf:type http://sswapmeet.sswap.info/TO/TO:... to classify it under the Trait Ontology. Search on "trait category" at http://www.gramene.org/qtl/help.html.