jman <emacs-orgm...@city17.xyz> writes:

> Note: I think it also works without setting `:environment tabular`, why?

The `:environment` attribute sets the LaTeX table environment, in this case 
tabular. If
you omit it, it uses `org-latex-default-table-enviroment', which defaults to 
"tabular", so
that wouldn't make a difference in this case.

Check out section "13.10.5 Tables in LaTeX export" of the Org manual:

    (info "(org) Tables in LaTeX export")

    ‘:environment’
         Set the default LaTeX table environment for the LaTeX export
         backend to use when exporting Org tables.  Common LaTeX table
         environments are provided by these packages: tabularx, longtable,
         array, tabu, and bmatrix.  [...]

For example, try this out:

#+ATTR_LATEX: :environment longtable :align |l|l|l|
|-----+-----+-------|
| one | two | three |
|-----+-----+-------|
|   1 |   2 |     3 |
|-----+-----+-------|

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