Returns:
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WOOF_Taxonomy
The first (or only) taxonomy object selected in the UI.
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WOOF_Silent
An object to allow sient failure, if the taxonomy has not been selected.
Implements MPFT::forward to return the first taxonomy, regardless of whether or not the field is setup to allow multiple taxonomies to be selected (iterator-related methods are setup to regard the multiple items though). This allows calls to be made on the field object directly as if the field is a taxomomy object itself.
Note: This method is intended for internal use and should not be called directly.