The function "convert_to(string text, dest_encoding name)" will throw an 
error and so break my application when not supported characters are 
included in the unicode string.
So what can I do
- to filter characters out which have no counterpart in the latin codesets
- or to simple ignore wrong characters?
Problem: Users will enter _any_ characters in my application and an 
error really doesn't help in this case.
What I am searching for is a function to undiacritic special letters to 
simple ones.
There is provided an example - 
http://www.postgres.cz/index.php/PostgreSQL_SQL_Tricks#Diacritic_removing 
- which will not work because of the error, when I put _any_ valid UTF8 
character to the functions.
Best,
Andi