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Names with internal-hyphens are strictly
notational macros, following the author's use of Cleanroom software engineering.
In class DayNotes, the child BirdForm instances can be generated in
phylogenetic order. The classification of each BirdForm is specified by an abbr.BirdId instance. This instance's
.txKey attribute gives us a
number that sorts forms phylogenetically.
However, the same .txKey (taxonomic key) can be related
to multiple different actual forms, so we use the English
name of the form as a secondary key. The actual key used
to order child nodes in a DayNotes
instance is a 2-tuple, (.
taxonomic
key, English
name)
#-- # phylo-key(birdId) == # (birdId.txKey, str(birdId)) #