INTERNATIONAL ISO/IEC STANDARD 14478-1 First edition 1998-12-15 Information technology --- Computer graphics and image processing Presentation Environment for Multimedia Objects (PREMO) - Part 1: Fundamentals of PREMO Technologies de I'information --- Infographie et traitement d'images - Environnement de preésentation d'objets multimédia (PREMO) Partie1:PrincipesfondamentauxdePREMO IEC Reference number ISO/IEC 14478-1:1998(E) ISO/IEC 14478-1:1998(E) Contents Page Foreword. iii Introduction. . iv 1 Scope. 2 Normative references 3 Definitions. .2 Symbols and abbreviations . 5 Conformance .6 b Requirements for PREMO 6.1 Introduction 6.2 Extensibility 6.3 Configurability 6.4 Incremental,separabledevelopment 6.5 Simplicity 6.6 Ease of use 8 6.7 Other influences 6.7.1 Application development environment. 6.7.2 Executionenvironment 6.8 Functionality. 6.8.1 Introduction 6.8.2 Computergraphics 6.8.3 User interfaces. ?ISO/IEC1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from thepublisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii @ ISO/IEC ISO/IEC 14478-1:1998(E) 6.8.4 Dynamic interactive graphics. 6.8.5 Animation. 10 6.8.6 Audio 10 6.8.7 Video.. 10 6.8.8 Other and future media. . . 10 6.8.9 Co-representations. 6.8.10 Cooperating applications 10 7 Architecture of PREMO 10 7.1 Introduction.... 7.2 The standards perspective .11 7.3 The functional perspective 7.3.1 Introduction. 7.3.2 Description techniques 11 7.3.3 The object model 12 7.3.4 Components 12 7.4 Thesystemperspective 12 7.4.1 Configuring PREMO-based applications. 12 7.4.2 Distributed multimedia..... 12. 7.4.3 Communication in PREMO 12 8 Object model. 13 8.1 Introduction. 13 8.2 Basic concepts. 8.3 Non-object types. 13 8.4 Object types. 14 8.5 Object identity and object reference 14 8.6 Operations. 14 8.7 Subtyping and inheritance. 15 8.7.1 Overview.. 15 8.7.2 Subtyping . 8.7.3 Inheritance 8.7.4 Operation.dispatching. 16 8.8 Abstract Types. 8.9 Operation request semantics 18 8.10 Protected operations 8.11 Object and object reference life cycles 19 8.12 Exceptions.. 20 9 How PREMO components are described. 21 A Notational conventions. . 22 A.1 Type declarations 22 A.2 Data type definitions . 22 A.2.1 Simple data type definitions . 22 A.2.2 Constructed type definitions. 24 A.3 Object type definitions . . . 25 A.4 Definition of finite state machines 26 A.5 Reference to operations and objects 27 A.6 Shorthands for operation specifications 27 A.6.1 State transition operations of finite state machines 28 A.6.2 Sequential composition of operations. 28 A.7 Specification of components and profiles 29 B Generic types..... C Graphical conventions........ C.1 Graphical conventions for generic types. 36 ili.