1、 INTERNATIONAL STANDARD IEC62298-4 First edition2005-10 TeleWeb application Part 4:Hyperteletext profile Reference number IEC 62298-4:2005(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numbering As from 1 January 1997 a
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7、 Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 LICENSED TO MECON Limited.-RANCHI/BANGAL
8、OREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONAL STANDARD IEC62298-4 First edition2005-10 TeleWeb application Part 4:Hyperteletext profile IEC 2005 Copyright-all rights reserved No part of this publication may be reproduced or utilized in any form or by any mean
9、s,electronic or mechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.ch W
10、For price,see current cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 62298-4 IEC:2005(E)CONTENTS FOREWORD.3 INTRODUCTION.5 1 Sco
11、pe.6 2 Normative references.6 3 Terms,definitions and abbreviations.7 3.1 Terms and definitions.7 3.2 Abbreviations.7 4 Mandatory Superteletext profile features.8 4.1 Font issues.8 4.2 Dithering.8 4.3 TeleWeb EPG.8 4.4 Cross-linking between services.8 4.5 Memory requirements.8 5 General display-rela
12、ted extensions.9 5.1 Downloadable fonts.9 5.2 Support for non-Latin alphabets.9 5.3 Page size and page scrolling.9 6 Hypertext extensions.9 6.1 HTML frames.10 6.2 Forms.16 6.3 Internationalization.25 6.4 tag.26 6.5 tag.27 7 User profiles.29 8 ISP interface.29 8.1 The ISP special function.29 8.2 Netw
13、ork congestion control.31 9 Device ID(OPTIONAL).33 10 Cross-linking and context-switching.33 10.1 Additional URI schemes.33 11 Audio clips(OPTIONAL).33 12 Style sheets.34 13 Scripting.34 13.1 ECMAScript.34 13.2 tag.35 13.3 Events.35 13.4 Document object model(DOM).35 14 Additional content types.35 1
14、4.1 Graphic files.35 14.2 Text files.35 Annex A(informative)Security considerations.36 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.62298-4 IEC:2005(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ TELEWEB APPLICATION Part 4:Hypertel
15、etext profile FOREWORD 1)The International Electrotechnical Commission(IEC)is a worldwide organization for standardization comprising all national electrotechnical committees(IEC National Committees).The object of IEC is to promote international co-operation on all questions concerning standardizati
16、on in the electrical and electronic fields.To this end and in addition to other activities,IEC publishes International Standards,Technical Specifications,Technical Reports,Publicly Available Specifications(PAS)and Guides(hereafter referred to as“IEC Publication(s)”).Their preparation is entrusted to technical committees;any IEC National Committee interested in the subject dealt with may participate in this preparatory work.International,governmental and non-governmental organizations liaising wi
