The Trellis project was funded by NSF grants IRI-9007756 and IRI-9015439.
It developed an integrated Petri-net model for specifying
hypertext and process control in a collaborative environment.
The results include the development of a unique system
for multi-reader hypertext and human-interaction called Trellis,
and its application to the expression, control,
and analysis of coordination protocols for group activities.
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Stotts Furuta
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The system is being used with astronomical images from NASA Goddard
to create browsing indexes in which usage protocols
(what visualization metjods to employ, to which collaborators
to distribute the data,
from which collaborators to expect responses, etc)
for the images have been encoded.