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" ... If you specify an animal that has a spinal cord (a chordate), that significantly reduces the number of classifications that are potentially relevant but have not yet been specified (i.e., it eliminates insects, shellfish, arthropods and so forth). Every time that you specify a facet value for a given facet, you are eliminating everything that isn't that facet value. From a hierarchical standpoint, you've moved your context so that you only consider those items that are at that node or branchward, while the path back to the root is clearly fixed. Note that this introduces an interesting characteristic of tree paths, however - the path back to the root is not only fixed in terms of the facets being constrained but is also fixed in order of how these facets are traversed. Pu, another way, the taxonomy is intrinsically directional. ... "