Reading Excel or Libreoffice files

[luciano de souza <luchyanus@...>]

Hello all,
I want to deal with Excel or Libreoffice files.
I found the package xlsxwriter, available as a rock.
But I could not find something to read a xls, xlsx or ods files. I am
in Linux, so I can't use luacom. I have few experience, so perhaps to
understand the xml structure of a xlsx file would not be viable.
Regarding this aspects, what do you think it's the best approach for me?

-- 
Luciano de Souza