[task #15912] VOTable input-output

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?15912>

                 Summary: VOTable input-output
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Sun 07 Mar 2021 02:39:52 AM UTC
         Should Start On: Sun 07 Mar 2021 12:00:00 AM UTC
   Should be Finished on: Sun 07 Mar 2021 12:00:00 AM UTC
                Category: Libraries
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

The Virtual Observatory's VOTable <https://ivoa.net/documents/VOTable> format
is an XML-based format for storing and sharing table data. It is one of the
core formats used in the Virtual Observatory and thus heavily used in
astronomy (for example see task #15911).

We should add features to read each necessary column of a VOTable into
Gnuastro's Generic data container
<https://www.gnu.org/software/gnuastro/manual/html_node/Generic-data-container.html>,
very similar to what we do with plain-text tables
<https://www.gnu.org/software/gnuastro/manual/html_node/Text-files.html> or
FITS tables
<https://www.gnu.org/software/gnuastro/manual/html_node/FITS-tables.html>.

There are several XML parser libraries that we can use, like libxml2
<http://xmlsoft.org> or expat <https://libexpat.github.io>.   




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