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in taxonomy domain, the number of rank is … in taxonomy domain, the number of rank is not fixed.
A taxonomy should contain at least the rank : species, genus, family, order, class, gender, phylum, kingdom. These rank are called major rank. But more rank can be specified like subspecies, super family, variety etc...
see the wikipedia page for more information
http://en.wikipedia.org/wiki/Taxonomic_rank
Thus the universal restriction constraints should be removed to be used by any kind of taxonomy. The constraint that fix the direct parent rank in the taxonomy can not be specified in this pattern. nomy can not be specified in this pattern.
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