Thanks for all the great replies on this. I'm amazed at the different
solutions people have come up with.
For now I suggest people have a play with the different suggestions
and we can come back to this later this month and come up with a
definitive solution.
Thanks
Jonathan.
On 29 Jun 2009, at 20:56, Ed wrote:
I think this is a useful feature. I think you should also consider
and test a variety of possible other syntax before making a
decision, though.
One simple alternative is to add two new fields to the segment
element:
<SEGMENT id="id" start="start" stop="stop" version="X.XX"
label="label" extendedStart="" extendedEnd="">
Here extendedStart and extendedEnd refer to the start and end of the
maximum-sized region that you could have asked for which would have
returned the same set of features.
Another simple alternative which requires NO new syntax would be for
the SEGMENT element to use the same format as before, but to allow
it to automatically stretch the start and end coordinates and return
them in the "start" and "end" fields.
<SEGMENT id="id" start="extendedStart" stop="extendedStop"
version="X.XX" label="label">
For example, if the user requests data for the region 1000 to 5000
but the response comes back as
<SEGMENT id="id" start="500" stop="6100" version="X.XX" label="label">
then the client would be able to know that there are no additional
features in the region from 500 to 6100. Older clients would
probably not notice that the returned start and end were different
from the requested start and end and could work as before.
Clients which cache results could cache this as covering the whole
region 500 to 6100 instead of just 1000 to 5000.
I'm not currently involved in any DAS parsing, so I'm not likely to
stay in this discussion. I just wanted to throw in this idea.
Ed Erwin
Affymetrix.
2009/6/29 Jonathan Warren <[email protected]>
Another feature we would like to add to the current 1.6 spec is the
ability for a server to return the next feature both left and right
of the current region if they exist but are out the currently
selected range.
Jonathan Warren
Senior Developer and DAS coordinator
[email protected]
Ext: 2314
Telephone: 01223 492314
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