Following on from a discussion at the DAS Workshop:
DAS doesn't have offer any specific support for clients that provide
mechanisms for skipping from the current position to the "next" or
"previous" feature. I'd like to propose a small extension (one extra filter
option on the existing "features" command) to facilitate this. Full details
are here:
https://github.com/dasmoth/dalliance/wiki/AdjacentFeatures
...but briefly, a request like:
/das/features?adjacent=chr21:30000000
...would be expected to return a standard DASGFF document containing the two
features either side of the specified point.
All comments are welcome! One open question is whether the query should *
just* return the adjacent features, or should also return other features
overlapping the adjacent feature. My preference is for them former, but the
latter does have the merit of being quirk-wards compatible with the existing
feature_id filter. Does anyone else have strong feelings one way or
another.
There isn't currently a full implementation of this, but if nobody comes up
with major objections, I'm hoping to try implementations in Dazzle (server)
and Dalliance (client) within the next couple of weeks.
Thomas.
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