Short description of this adaptor can be viewed at
There was no intent to actually advertise it to other
projects or to make it conveniently accessible to
potential users. It powers FlyBase GBrowse and
was written with just one goal in mind - to have
an adaptor which shows good performance (and low
maintenance) when other adaptors choke (like we
have 16 viewable genomes, any one can have
like 20 million features [Dmel] or like 10 thousand
separate sequenced contigs [Dana Dper and others]).
It is kind of internal thingie, to serve project needs..