[DAS2] tiled queries for performance

[Helt,Gregg]

I don't think we should allow servers to return features than do not
meet the criteria specified in the query feature filters, it's an
invitation for ambiguity.  This may seem harmless with just an
"overlaps" region filter, but what about "inside", "contains",
"identical"?  What about "type", etc?

If different DAS/2 server implementations contain the same data, they
should return the same set of features for a given feature query.

	gregg

> -----Original Message-----
> From: das2-bounces at portal.open-bio.org
[mailto:das2-bounces at portal.open-
> bio.org] On Behalf Of Andrew Dalke
> Sent: Friday, November 25, 2005 3:43 PM
> To: Asim Siddiqui
> Cc: DAS/2
> Subject: Re: [DAS2] tiled queries for performance
>
> > The change is simply that instead of the client getting exactly what
it
> > asks for, it may get more.
> 
> While that's another matter - the client makes a request
> and the server is free to expand the range to something it can handle
> a bit better.  Allen?  Were you suggesting this instead?
> 
> In this case there is a change to the spec, and all clients must
> be able to filter or otherwise ignore extra results.
> 
> I personally think it's an implementation issue related to performance
> and there are ways to make the results be generated fast enough.
> 
> 					Andrew
> 					dalke at dalkescientific.com
>