# taxonomic_constraint (Constrain by Higher Taxonomy): selects lower ranks

	#  only from within the matched higher ranks. must be turned on, to ensure

	#  that higher ranks are always authoritative.

	# source_sorting (Constrain by Source): always selects a match from the

	#  first source in the list, no matter how low the match score. must be

	#  turned off, to avoid worse matches being selected instead of better ones.