IEC INTERNATIONAL STANDARD 62298-4 First edition 2005-10 TeleWeb application - Part 4: Hyperteletext profile IEC Referencenumber IEC 62298-4:2005(E) Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example, IEC 34-1is now referred to as IEC 60034-1. Consolidated editions The IEc is now publishing consolidated versions of its publications. For example. edition numbers 1.0, 1.1 and 1.2 refer, respectively,to the base publication, the amendments 1 and 2. FurtherinformationonIECpublications The technical content of IEC publications is kept under constant review by the IEC, this.publication, including itsvalidity, is available in the IEc Catalogue of publications (see below) in addition to new editions, amendments and corrigenda. information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication, as well as the list of publications issued, is also available from the following: IEc Web Site (www.iec.ch) Catalogue of IEC publications The on-line catalogue on the IEC web site (www.iec.ch/searchpub) enables you to search by a variety of criteria including text searches, technical committees and date of publication. On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. IEC Just Published This summary of recently issued publications (www.iec.ch/online news/ justpub) is also available by email.Please contact the Customer Service Centre (see below) forfurther information. Customer Service Centre If you have any questions regarding this publication or need further assistance. please contact the Customer Service Centre: Email: [email protected] Tel: +41 22 919 02 11 +41229190300 Fax: IEC INTERNATIONAL STANDARD 62298-4 First edition 2005-10 TeleWeb application Part 4: Hyperteletext profile IEC 2005— Copyright-all rights reserved mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varembe, PO Box 131, CH-1211 Geneva 20, Switzerland W IEC PRICE CODE Commission Electrotechnique Internationale International Electrotechnical Commission MexAyHapoAHagSnekTpoTexHuyeckasKoMuCCMg For price, see current cafalogue 62298-4@IEC:2005(E) 2 CONTENTS FOREWORD. INTRODUCTION. Scope. 6 Normative references.. 2 :6 3 Terms, definitions and abbreviations 3.1 Terms and definitions 3.2 4 Mandatory Superteletextprofile features 8 4.1 Font issues. 4.2 Dithering .... 4.3 TeleWeb EPG 4.4 Cross-linking between services 4.5 Memory requirements.. General display-related extensions. 5 5.1 Downloadable fonts.. 5.2 Support for non-Latin alphabets 5.3 Page size and page scrolling... Hypertext extensions.. 9 6 6.1 HTML frames. Forms. .16 6.2 6.3 Internationalization. 25 6.4 <FONT> tag , .26 <TIME> tag 6.5 27 7 User profiles... ..29 8 ISP interface .. 8.1 The IsP special function. .29 8.2 Network congestion control .. .31 9 Device ID (OPTIONAL)... .33 10 Cross-linking and context-switching.. ..33 10.1 Additional URIschemes. 11 Audio clips (OPTIONAL).. .33 12 Style sheets .34 13 Scripting. .34 13.1ECMAScript... .34 13.2 <SCRIPT>tag. ..35 13.3 Events... .35 13.4 Document object model (DOM). .35 14 Additional contenttypes.. ...35 14.1 Graphic files.. ...35 14.2 Text files.. .35 AnnexA(informative) Security considerations. .36 - 3 - 62298-4IEC:2005(E) INTERNATIONALELECTROTECHNICALCOMMISSION TELEWEB APPLICATION Part 4: Hyperteletext profile FOREWORD The International Electrotechnical Commission (IEC)is a worldwide organization for standardization comprising 11 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote 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