PL\Pgsql Custom Function Error

[Momentum]

Is it allowed to use character varying type without the length? According to the docs ( http://www.postgresql.org/docs/9.1/s...character.html ) this type requiers the length to be set:

thanks for replying

I read that page before, the following sentences suggest I should be ok

 If character varying is used without length specifier, the type accepts strings of any size.The latter is a PostgreSQL extension.

The last sentence was somewhat confusing, does it mean that I need to extend PostgreSQL in order to achieve that behavior? I would assume the term standard being used if that behavior was the norm