I spent some time working with taxonomies and ontologies, and switched
to generally preferring that the permanent names for things be in a flat
namespace, and that any organizations (e.g., hierarchical) be separate,
indirect, and more fluid.
One possible exception is when there is a strong, exclusive, permanent
``part of'' relationship.
For example, I think that the PlaneT categories are already getting
outdated, and I am glad that the categories are not used in naming.
Neil V.
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