IVOA LSST talk and JSON format for TAP

[Pierre Fernique]

Hi All,
May be, it could help.
In the MOC standard document, we just suggested one way to serialize MOC 
in JSON. It is not in the standard part of the document, but just as an 
advise. An concretely we see more and more clients and servers using 
this JSON serialization when it is required (mainly in JS world) and not 
another JSON dialect. It could be a quite pragmatic and efficient approach.
Cheers
Pierre




Le 13/05/2016 10:37, Marco Molinaro a écrit :
> Hi all,
> I copy the idea of a Note, but warn against making this a standard,
> otherwise we'll end up standardizing all possible serializations of
> the models exposed by REC-output plus VOTable.
> I also think that the note effort shouldn't stop at TAP benefit, it
> should be a bit broader in the direction Pat's suggesting.
> So the difficult thing will be: choose the correct compromise between
> the lightness that JSON provides and the richness the XML/VOTable can
> contribute. (I know, it's a trivial statement, but melius abundare
> quam deficere)
> Also, there are many places JSON is showing up in the VO, not only in
> responses...maybe we should keep this in mind too.
>
> Cheers,
>      Marco
>
>
> 2016-05-13 10:22 GMT+02:00 Stelios Voutsinas <stv at roe.ac.uk>:
>> Hi Brian and DAL.
>>
>> Our approach matches your minimal version, and we have a client that runs a TAP request in JS, so I see a good case for JSON as an alternative option to VOTable.
>> If we were to standardize, I would be cautious of over complicating it and having it lose the simplicity,which is the main reason why we are using it in the first place.
>> There probably are cases that I have not thought about however, so I'd be interested to see other implementations as well.
>>
>> So +1 from me for adding a note for this.
>>
>> Cheers,
>> Stelios Voutsinas
>>
>> ________________________________________
>> From: dal-bounces at ivoa.net [dal-bounces at ivoa.net] on behalf of Van Klaveren, Brian N. [bvan at slac.stanford.edu]
>> Sent: Thursday, May 12, 2016 4:17 PM
>> To: dal at ivoa.net
>> Subject: IVOA LSST talk and JSON format for TAP
>>
>> Apologies if this goes through multiple times... this internet is quite flaky.
>>
>>
>>
>> Hi all,
>>
>>
>> If you are interested in my presentation about LSST and TAP/ADQL, i've uploaded the PDF to dropbox right now (until I can get it on the wiki):
>>
>> https://www.dropbox.com/s/l89mpih9dmk2q3a/LSST_DAX_IVOA_Interop_May-2016.pdf?dl=0
>>
>>
>>
>> Also, not sure if I'm going to make it to the meeting later, I need to take care of a few things for work as people in the US wake up and need a decent connection.
>>
>>
>> That said, if you end up talking about JSON, I was just going to post my example JSON response format for TAP and mention a few things about it:
>>
>>
>> https://gist.github.com/brianv0/07cf0acd83bde6f450a9
>>
>>
>>  From my perspective, there's two use cases of a JSON response for TAP.
>>
>>
>> 1. A 1:1 (or near to it) alternative to VOTable.
>>
>> 2. A simplified/minimal version intended to be very easy to use from Javascript.
>>
>>
>> For the first case, the output of something like that might look like the link above.
>>
>>
>> For the second case, a minimal representation might look like this:
>>
>>
>> {
>>
>>    "columns": [
>>
>>       {"name":"foo", "datatype":"int"},
>>
>>       {"name":"bar", "datatype":"long"}
>>
>>       {"name":"baz", "datatype":"double"}
>>
>>    ],
>>
>>   "data" : [
>>
>>     [ 1, "1.12", 2.123]
>>
>>     [ 2, "1.34", 2.345]
>>
>>     [ 3, "1.56", 2.678]
>>
>>    ]
>>
>> }
>>
>>
>> This is extremely easy to deal with via javascript.
>>
>>
>> i.e:
>>
>>
>> var table = $(/* call TAP here via jquery */);
>>
>> table.columns.forEach(function(i){ console.log(i.name)}); // log names
>>
>> table.rows.forEach( doSomethingWIthRow );
>>
>>
>>
>> So, if you end up talking about a JSON format, please consider these two potential use cases.
>>
>>
>> Thanks,
>>
>> Brian
>>

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