How to SELECT from object type column in Oracle 11g?

Hy guys, I have following two Oracle objects: ``` CREATE OR REPLACE TYPE car AS OBJECT( name VARCHAR( 80 ) ) NOT FINAL; ``` And also, there is another object: ``` CREATE OR REPLACE TYPE truck UNDER car ( doors NUMBER, seats NUMBER ); ``` There is also following table: ``` CREATE TABLE vehicles ( id NUMBER NOT NULL, vehicle car, PRIMARY KEY (id) ); ``` Here is some data: ``` INSERT INTO vehicles ( id, vehicle ) VALUES ( 1, truck( 'ford', 4, 4 ) ); INSERT INTO vehicles ( id, vehicle ) VALUES ( 2, truck( 'toyota', 4, 5 ) ); ``` Finally, my question is: How to select only number of doors and number of seats from vehicle table column? I tried following but it does not work: ``` SELECT v.vehicle.doors AS doors AS seats FROM vehicles v; ``` I got following error: ``` ORA-00904: "V"."VEHICLE"."DOORS": invalid identifier ``` Only parameter that i can get without any error is one from car object. FYI, I am using Oracle 11g on CentOS 6.2 Cheers, Bojan