What world ranking can qualify for the world championships? Is there a limit on the maximum number of players/pairs a country can send?

1. For all events, BWF will take the top 64 ranked pairs/players, starting 1 year before the Championships.
2. The maximum number a country/Member Association can send is 4 players or pairs.

http://internationalbadminton.org/statues1-pdf/Part%20III%20Section%208B%20-%20World%20Championships.pdf

each country can send 4 players or pairs?
Initially I thought each country only can send 3 players or pairs, haha

..forgot to add:
max. 4 players or pairs for each event. So, say CHN, they can have 8 Singles players and 12 different Doubles pairs (24 players), totaling 32 players.
http://tournamentsoftware.com/sport/tournament.aspx?id=E9967735-FBFE-4C65-AB6C-EBF28796D843 (2007 World Championships)