[DAS] segments, features and overlaps

[Lincoln Stein]

Ah, you can see how late my e-mail is running.  

The answer to this is that I think it is highly desirable to return features 
that overlap the segment boundary and to return the non-clipped object.  This 
has the effect of producing features where one end is inside the requested 
range and the other end is outside.  This was required by the version 0.95 
spec.

As I recall, there was some concern on the part of server implementors that 
the search for overlapping features was going to be computationally awkward, 
and so the requirement was made optional.

Lincoln


On Thursday 15 May 2003 03:39 pm, Tony Cox wrote:
> This is a general question - the current DAS spec states:
>
> "Annotation servers are only required to return annotations which are
> completely contained within the indicated segment. Servers may also return
> annotations which overlap the segment, but are not completely contained
> within them"
>
> There is a bit of room for choice here and I was wondering if there is any
> consensus for supplying features that overlap a requested segment boundary
> or not? Also I presume that this also applies to reference servers?
>
> I think dazzle doesn't?
>
> Tony
>
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-- 
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Lincoln D. Stein                           Cold Spring Harbor Laboratory
lstein at cshl.org			                  Cold Spring Harbor, NY
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