Name of databases, tables, attributes and types

Hello Everybody,

Does anybody know how to get :   

• the names of all the databases
• for each database, the name of all its tables
• for each table, the name of all its attributes with their type

Do you know the tables I hava to query to get these infos ?

-- 
       \
       |\                                             
----- -|/------------------------------------------------------------
       /                     Marc Mouriès                        
------/|---------Universite de Nice Sophia Antipolis-----------------
     / |                       FRANCE
----/- |-------------------- IUP MIAGE-------------------------------
   |   |            University  :   mmouries_at_miage.unice.fr 
 ---| -/|\------------------------------------------------------------
   |     |             CNRS-2LC :  mouries_at_tana.unice.fr     
----\--|-/-----------------------------------------------------------
     \ _/      "When music and courtesy are better understood
       |       and appreciated, there will be no war."  
      \|                                                -Confucius