CONTENTS

 1     Scope 
 2     References 
 3     Definitions  
 4     Abbreviations   
 5     Conventions     
 6     Data architecture 
        6.1     Three-schema architecture 
        6.2     Seven-schema architecture 
        6.3     Communication and distribution      
        6.4     Nesting   
Annex A – Requirements on schema notations    
        A.1     Introduction          
        A.2     Requirements on notations for the external terminology schemata    
        A.3     Requirements on notations for the concept schemata          
        A.4     Requirements on notations for the contents schemata         
        A.5     Requirements on notations for the layout schemata 
        A.6     Requirements on notations for internal terminology schemata          
        A.7     Requirements on notations for the distribution schemata     
        A.8     Requirements on notations for the physical schemata          
        A.9     Requirements on notations for the system management schemata    
Appendix I – Introduction to data architectures     
        I.1        A system planning perspective      
        I.2        A data perspective on a system    
        I.3        Communication between systems 
        I.4        Communicating processes
        I.5        Separation of media         
Appendix II – Comparison with other architectures    
       II.1     Comparison with ITU-T Rec. M.3020       
Bibliography