[DAS] LINK command questions

[Lincoln Stein]

Hi Ethan,

The ID passed to the link request is the ID of the feature, not the ID of an 
arbitrary part of the features response.  So there is no way to ask for a 
page describing type=exon without having an exon in hand.  This is stupid, 
but since no one has implemented the link request, nobody noticed before!

Lincoln

On Monday 04 November 2002 01:45 pm, Ethan Cerami wrote:
> Hi Everybody:
>
> From my reading of Dave Wall's thread, I understand
> that there are not any reliable implementations of the
> LINK command.
>
> However, I was hoping that someone could explain the
> spec. to me.
>
> The spec states that you must specify a field and an
> ID.  Let's assume I have a feature ID = foo1, and
> let's also assume that foo1 type = exon.  I can issue
> the following commands:
>
> PREFIX/das/DSN/link?field=feature;id=foo1
>
> this retrieves a web page with info. on the actual
> feature.
>
> Next, I can issue this command:
>
> PREFIX/das/DSN/link?field=type;id=foo1
>
> my assumption is that I will now get back a web page
> with information about this feature type.  In this
> case, I would get back some type of information about
> exons.
>
> Is that correct?
>
> Second, the spec says that I can link to pages for a
> specific type.  Let's say I want to look up
> typeid=exon all by itself (without having a feature)
>
> What would this request look like?
>
> PREFIX/das/DSN/link?field=type;id=exon?
>
> The field=type now seems redundant as exon is a type;
> and leads to further confusion.  For example, can I
> request the field=feature for an exon?
>
> Any help would be appreciated.  Many thanks,
>
> Ethan
>
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-- 
Lincoln Stein
lstein@cshl.org