OFFICIALS - RECRUITMENT - COMPETITION - CONDITIONS FOR ADMISSION - EXTENSION OF THE AGE-LIMIT FOR EXISTING EMPLOYEES - EMPLOYMENT - CONCEPT - EMPLOYEES OF THE EUROPEAN CENTRE FOR THE DEVELOPMENT OF VOCATIONAL TRAINING - NATURE AND FUNCTIONS OF THE CENTRE - EMPLOYEES OF THE CENTRE ARE EMPLOYEES OF THE EUROPEAN COMMUNITIES ( STAFF REGULATIONS OF OFFICIALS , ANNEX III , ART . 1 ( 1 ); COUNCIL REGULATIONS NOS 337/75 AND 1859/76 )