Обсуждение: actualised plpgsql tutorial

Hello

I actualised plpgsql tutorial on address
http://www.pgsql.cz/index.php/PL/pgSQL_%28en%29#Design_of_triggers_in_PL.2FpgSQL

I hope so this document can be useful for people who start with plpgsql.

Sorry - my English is good for reading mailing list and coding in C
lang. Can some native english speaker look on this document and
correct some errors and mistakes?

Thank you

Regards

Pavel Stehule