program DELTA

The DELTA format (DEscription Language for TAxonomy) is a flexible method for encoding taxonomic descriptions for computer processing. It has been adopted by the International Taxonomic Databases Working Group (TDWG) as a standard for data exchange. DELTA-format data can be used to produce natural-language descriptions, interactive or conventional keys, cladistic or phenetic classifications, and information-retrieval systems.
(http://biodiversity.bio.uno.edu/delta/)