Product Classification Taxonomic Module
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The Product Classification Taxonomic module adds the taxonomic classification
to the products.

The available classifications are:

Taxon
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A `taxon <http://en.wikipedia.org/wiki/Taxon>`_ is defined by a name and a
`taxonomic rank <http://en.wikipedia.org/wiki/Taxonomic_rank>`_. It is stored
inside a tree structure.

Cultivar
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A `cultivar <http://en.wikipedia.org/wiki/Cultivar>`_ is defined by a name, a
taxon and a list of `cultivar groups
<http://en.wikipedia.org/wiki/Cultivar_group>`_.
