Hi Vladimir,

[...]
>
> At first, I thought about table in org file with three columns:
>
> | Keybind | Code | Description |
> |---------+------+-------------|
>
> but I don't know how to exclude second column in html export and how
> to generate xml code excluding the third column.
>

See the attached example Org-mode file, it does what you describe above.

>
> P.P.S. Side note: why then 'tangled' example.txt the first line is empty one?

Set ":padline no" on the tangled block to change this behavior (as in
the attached example).

Best,