Tweaking lib/symbols for XML entities

[Kornel Benko]

Am Mon, 15 Jun 2020 01:54:57 +0200
schrieb Thibaut Cuvelier <dourouc05 at gmail.com>:

...
>  
> Here is a new version addressing this! I let the function return a docstring, to avoid
> changing too much the initial code without a good reason to do so. 

Thanks, no warnings.

My try to export was not successful though.
	Error: Couldn't export file
	----------------------------------------
	No information for exporting the format MS Excel Office Open XML.

Is this the wrong export?
Do I need some external converter?

	Kornel
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