Re: [Plastic-devs] spectrum load message

[Noel W. <Noe...@ma...>]

On 13 Sep 2006, at 12:42, Thomas Boch wrote:

> Hi Mark,
>
>
>> So I've revised my proposal, as follows:
>>
>>    boolean ivo://votech.org/spectrum/loadFromURL( String url,  
>> String id,
>>                                                   Map meta )
>>
>>       Loads a spectrum or SED. id is an identifier as for the VOTable
>>       load message - use the URL if there's no reason to do  
>> otherwise.
>>       The meta argument is a map/struct containing additional
>>       information about the type of data found at url which encodes
>>       the spectrum. The entries of this map take the form of
>>       utype->value pairs, where the keys (utypes) are as defined
>>       in the SSAP specification, e.g. "Access.Format" for MIME
>>       type. As many or few of these entries as are known may be
>>       filled in.
>>
>> (...)
>>
>> Sending this message should be easy to implement by an SSAP client
>> (e.g. AstroScope) which wants to pass the spectrum selection on to
>> viewers, since it can just scoop up the fields from the relevant
>> row of the SSAP response VOTable and pass them on in a Map without
>> having to know or care what they mean.
>
> I agree, this sounds sensible and pragmatic to me.

agreed.

>
>> This message can of course be used to pass spectra around which
>> do not result from actual SSAP queries, since you can add metadata
>> map entries by hand as if they'd come from SSAP (or just leave the
>> metadata map empty).
>
> Indeed, it is important to leave the door open for spectra *not*  
> coming
> from an SSAP service (eg. local files, MySpace account). For those
> spectra, we certainly won't have all the metadata Isa has  
> described, and
> it will be up to the spectrum tool to try to obtain needed metadata  
> from
> the spectrum itself.
> Thus, I think we should precise that tools sending a
> ivo://votech.org/spectrum/loadFromURL message should give as many
> metadata information as they can, but that no parameter is really
> 'compulsory'.

makes perfect sense to me.


If there's no objections, I'll make a start on implementing this in  
astroscope - hope to have it done for Moscow.



>
> Cheers,
>
> Thomas
>
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