DAL Running Meeting #20 - Spectral lines

[Gregory MANTELET]

Dear DAL members and DM chairs,

In the IVOA and more specifically in DAL, we do not have yet a stable 
solution
to give access to spectral lines.

For the record, REC-SLAP-1.0 
<https://urldefense.com/v3/__https:/www.ivoa.net/documents/SLAP/20101209/index.html__;!!CrWY41Z8OgsX0i-WU-0LuAcUu2o!xXw1mHo0wm3raE559ej1IyKbxHBjoMMlryx6v15g6O7w1x8ZR81QKXwP1I5nlR7-UcBQXZvoXmRCCYatsYOGwMbd83I_vof7nqpG$> 
(Simple Line Access Protocol) was published in
2010. Very few SLAP-1.0 services are available in the IVOA Registry. It 
seems
that the data model proposed by this protocol is not complete enough: 
SSLDM-1.0 
<https://urldefense.com/v3/__https:/www.ivoa.net/documents/SSLDM/20101209/index.html__;!!CrWY41Z8OgsX0i-WU-0LuAcUu2o!xXw1mHo0wm3raE559ej1IyKbxHBjoMMlryx6v15g6O7w1x8ZR81QKXwP1I5nlR7-UcBQXZvoXmRCCYatsYOGwMbd83I_vtjRWL8f$>.
With the help of VAMDC, a second version has been proposed: SLAP-2.0 
<https://urldefense.com/v3/__https:/www.ivoa.net/documents/SLAP/20190409/__;!!CrWY41Z8OgsX0i-WU-0LuAcUu2o!xXw1mHo0wm3raE559ej1IyKbxHBjoMMlryx6v15g6O7w1x8ZR81QKXwP1I5nlR7-UcBQXZvoXmRCCYatsYOGwMbd83I_vnbPwp32$>. 
It is a
Working Draft since 2019. In parallel SSLDM-2.0 
<https://urldefense.com/v3/__https:/www.ivoa.net/documents/SSLDM/20190909/__;!!CrWY41Z8OgsX0i-WU-0LuAcUu2o!xXw1mHo0wm3raE559ej1IyKbxHBjoMMlryx6v15g6O7w1x8ZR81QKXwP1I5nlR7-UcBQXZvoXmRCCYatsYOGwMbd83I_vi9pVVfw$> 
(also in 2019) is a Proposed
Recommendation and reaches the RFC stage. Both have been frozen in order to
explore an alternative solution: LineTAP 
<https://urldefense.com/v3/__https:/www.ivoa.net/documents/LineTAP/20241121/index.html__;!!CrWY41Z8OgsX0i-WU-0LuAcUu2o!xXw1mHo0wm3raE559ej1IyKbxHBjoMMlryx6v15g6O7w1x8ZR81QKXwP1I5nlR7-UcBQXZvoXmRCCYatsYOGwMbd83I_vm3C8Fl8$>. 
It is based on TAP and defines a
different and independent data model.

It is now time to decide which protocol is the most helpful from the 
point of
view of data providers and users. This is the goal of the DAL Running 
Meeting
that Joshua and I are now proposing. Note that, as the main actors for 
spectral
lines, I had recently a meeting with VAMDC and CASSIS developer in order 
to have
their point of view and see what would be their preferred solution and 
why. I
will start the running meeting by giving conclusions of this side meeting.

@Mark, Mathieu: I invited both of you because providing spectral lines 
implies
data models and more specifically SSLDM. It would nice to have one of you
during this meeting.

Anyway, in order to find the best possible date, please, answer to the 
following poll
before the 2nd of May:

https://strawpoll.com/xVg716X0Qyr 
<https://urldefense.com/v3/__https:/strawpoll.com/xVg716X0Qyr__;!!CrWY41Z8OgsX0i-WU-0LuAcUu2o!xXw1mHo0wm3raE559ej1IyKbxHBjoMMlryx6v15g6O7w1x8ZR81QKXwP1I5nlR7-UcBQXZvoXmRCCYatsYOGwMbd83I_vhVvE-8W$>

As usual, this meeting will be one hour long and will be remote (using 
Zoom).

Best regards,
Grégory and Joshua
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