[DAS] 1.6 draft 7

David Nix David.Nix at hci.utah.edu
Wed Sep 22 20:33:33 UTC 2010

Bugger, that's unfortunate.  Without alternative formats, it is impossible to distribute genomic data from next generation sequencing and microarray experiments in a timely manner.  Even then, the data transfer is very slow due to the <2MB/s bandwidth limitation.

I wonder if folks should be encouraged to use DAS/2 for genomic data distribution and DAS/1 for everything else?  There seems to be a great reluctance to add alternative formats to DAS/1.  I can understand the advantages of having a standardized data distribution format.  Unfortunately this won't work for us, even compressed, DAS GFF XML is about 100x larger than some of the other binary genomic data formats such as bar and useq.

I'm afraid DAS is going to get left behind as other data distribution models are adopted that can accommodate the ever growing density of genomic data.

What do you think?

-cheers, D

On 9/22/10 10:51 AM, "Andy Jenkinson" <andy.jenkinson at ebi.ac.uk> wrote:

Hi David,

It is not part of DAS 1.6 but was discussed at the DAS workshop. During the workshop we had some discussion on the topic and came up with a couple of sensible proposals for an extension to 1.6 to cover it. If my memory serves me we agreed on an outline proposal, and there is a write up on http://www.biodas.org/wiki/DAS1.6E (courtesy of Gregg? Is that correct?) but as far as I know there are no implementations as yet.


On 22 Sep 2010, at 17:17, David Nix wrote:

> Hello Andy,
> I'm looking at the latest and trying to find out if alternative file formats were added to 1.6?  Can one respond to DAS/1 queries with binary data formats or is it still XML?  If the later, any time frame for when this will be added?
> -cheers, D
> --
> David Austin Nix, PhD | Bioinformatics Shared Resource | Huntsman Cancer Institute | 2000 Circle of Hope | SLC, UT 84112 | Rm: 3165 | Vc: 801.587.4611 | Fx: 801.585.6458 | david.nix at hci.utah.edu | Skype/iChat: LiveNix | WebSite: http://bioserver.hci.utah.edu | DAS/2: http://bioserver.hci.utah.edu:8080/DAS2DB/genome
> On 9/22/10 9:44 AM, "Andy Jenkinson" <andy.jenkinson at ebi.ac.uk> wrote:
> Hi all,
> I have updated the 1.6 specification to draft 7 in light of recent discussions on the list:
> 1. All features in a parent/part hierarchy must be returned if any overlap a query segment.
> 2. The alignment command is back to extension status, in anticipation of a revamp (see the 1.6E page on the wiki).
> Also in this draft is a previous change that was missed: the start and end attributes of a SEGMENT element in the features, types and entry_points commands are now optional. This makes it possible for servers without access to detailed information about the segments they are annotating to comply with the specification. Previously, it was impossible for such servers to respond in a compliant fashion to requests in which the client does not specify a start/end position.
> If my understanding is correct, no further changes to the specification are anticipated which means we can consider this the final draft...
> See here for details:
> http://www.biodas.org/wiki/DAS1.6
> Cheers,
> Andy
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