[DAS] Adjacent feature extension

[Andy Jenkinson]

On 7 Mar 2011, at 12:57, Thomas Down wrote:

> On Mon, Mar 7, 2011 at 12:43 PM, Andy Jenkinson <andy.jenkinson at ebi.ac.uk> wrote:
> We should be under no illusions though that people are going to be able to implement this easily without reading the documentation carefully, no matter which option is chosen. In particular, I can foresee servers not interpreting the "type" filter appropriately, being likely to process the adjacent query then apply the type filter, which would be wrong. I have a feeling most sources implement the type filter as a passive "post filter" rather than an active one. I can tell you right now that it is going to be really quite difficult for me to implement "adjacent" correctly for the ASTD gene/transcript/exon sources, and I suspect the same will be true for retrofitting lots of other sources.
> 
> I appreciate this is tough.  However, given the existence of  UCSC-like "super-sources" containing basically unrelated types, with potentially quite different densities and dispositions, I find it hard to see how this is going to be useful without some kind of interaction with the types filter along the lines of what I've proposed.

Absolutely.