SIST EN 62298-3:2006

Teleweb application -- Part 3: Superteletext profile

This part of IEC 62298 specifies the TeleWeb Superteletext profile that allows Web-style text and graphics to be displayed on suitable decoders. A TeleWeb service comprises multimedia data files whose format and attributes are defined by this specification. This specification focuses on the presentation layer especially the implementation of TeleWeb HTML. It further defines graphical requirements like colours and fonts and the used content formats. For information regarding general information and the transport layer, refer to IEC 62298-1 and IEC 62298-2.

TeleWeb-Anwendung -- Teil 3: Superteletext-Profil

Application Teleweb -- Partie 3: Profil supertélétexte

specifies the TeleWeb Superteletext profile that allows Web-style text and graphics to be displayed on suitable decoders. A TeleWeb service comprises multimedia data files whose format and attributes are defined by this specification. This specification focuses on the presentation layer especially the implementation of TeleWeb HTML. It further defines graphical requirements like colours and fonts and the used content formats

Televizijski splet (teleweb) – 3. del: Profil superteleteksta (IEC 62298-3:2005)

General Information

• Status: Published
• Publication Date: 31-Dec-2005
• ICS: 33.170 - Television and radio broadcasting
• ICS: 35.240.95 - Internet applications
• Technical Committee: AVM - Audio, video and multimedia systems and equipment
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2006
• Due Date: 01-Jan-2006
• Completion Date: 01-Jan-2006
• Ref Project: EN 62298-3:2005 - Teleweb application - Part 3: Superteletext profile

Standards Content (Sample)

SLOVENSKI SIST EN 62298-3:2006

STANDARD
januar 2006
Televizijski splet (teleweb) – 3. del: Profil superteleteksta (IEC 62298-3:2005)
(istoveten EN 62298-3:2005)
Teleweb application – Part 3: Superteletext profile (IEC 62298-3:2005)
ICS 33.170; 35.240.99 Referenčna številka
SIST EN 62298-3:2006(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 62298-3
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2005

ICS 33.170; 35.240.99


English version


Teleweb application
Part 3: Superteletext profile
(IEC 62298-3:2005)


Application Teleweb TeleWeb-Anwendung
Partie 3: Profil supertélétexte Teil 3: Superteletext-Profil
(CEI 62298-3:2005) (IEC 62298-3:2005)






This European Standard was approved by CENELEC on 2005-06-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62298-3:2005 E

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EN 62298-3:2005 - 2 -
Foreword
The text of document 100/924/FDIS, future edition 1 of IEC 62298-3, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 62298-3 on 2005-06-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-03-01
-– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-06-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62298-3:2005 was approved by CENELEC as a European
Standard without any modification.
__________

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- 3 - EN 62298-3:2005
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 62297-1 - Triggering messages for broadcast EN 62297-1 2005
applications
Part 1: Format

1)
ISO 639-2 - Codes for the representation of names of - -
languages
Part 2: Alpha-3 code

1) 2)
ISO 8601 - Data elements and interchange formats - EN 28601 1992
Information interchange - Representation
of dates and times

ISO/IEC 8859-1 1998 Information technology - 8-bit single-byte - -
coded graphic character sets
Part 1: Latin alphabet No.1

1)
ETSI TS 101 231 - Television systems - Register of Country - -
and Network Identification (CNI), Video
Programming System (VPS) codes and
Application codes for Teletext based
systems

1)
ETSI EN 300 231 - Television systems - Specification of the - -
domestic video Programme Delivery
Control system (PDC)

1)
ETSI EN 300 468 - Specification for Service Information (SI) - -
in DVB systems

1)
ETSI EN 300 706 - Enhanced teletext specification - -

1)
ETSI EN 300 707 - Electronic Programme Guide (EPG) - - -
Protocol for a TV Guide using electronic
data transmission



1)
Undated reference.
2)
Valid edition at date of issue.

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INTERNATIONAL IEC


STANDARD 62298-3





First edition
2005-05


TeleWeb application –
Part 3:
Superteletext profile

 IEC 2005  Copyright - all rights reserved
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 the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale XD
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue

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– 2 – 62298-3  IEC:2005(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.7
2 Normative references .7
3 Terms, definitions and abbreviations .8
3.1 Terms and definitions .8
3.2 Abbreviations .8
4 Display .9
4.1 Colour representation.9
4.2 Text representation .10
4.3 Text placement.12
4.4 Image representation .13
4.5 4:3 and 16:9 aspect ratio displays .13
5 URLs .14
5.1 File naming .15
5.2 Access through page number .15
5.3 TeleWeb file reference scheme .16
5.4 Teletext page reference scheme.18
5.5 NexTView reference scheme .19
5.6 Special function URLs .20
6 Text and hypertext.20
6.1 TeleWeb HTML file format.20
6.2 Syntax of TeleWeb HTML tags .22
6.3 Document structure elements .24
6.4 Header section tags .27
6.5 Paragraph formatting.29
6.6 Character formatting.32
6.7 Hypertext links .36
6.8 Lists .41
6.9 Tables .44
6.10 Images .50
6.11 Ticker text .53
6.12 Exceptional ignored tags .55
7 TeleWeb default style .55
8 Image files.55
8.1 GIF.55
8.2 JPEG .56
9 Content labelling .56
9.1 Predefined themes and identifier coding.56
9.2 Parental ratings.56
10 Special data .56
10.1 Service identification graphic.56
10.2 Home page.57
10.3 Default page.57

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62298-3  IEC:2005(E) – 3 –
10.4 Profile upgrade page .57
10.5 ZLIB dictionary files .57
11 Service-related attributes.58
11.1 Name .58
11.2 Information .58
11.3 Language .58
11.4 Transmission schedule .58
12 File-related attributes.59
12.1 General file attributes .60
12.2 File content attributes .61
12.3 Time- and date-related attributes .62
12.4 Storage-related attributes .63
12.5 Special function attributes.63
13 Short and full TeleWeb service .64
14 Individual addressing – Group addressing .65

Annex A (informative)  HTML compatibility .66
Annex B (normative)  Default colour palette specification.69
Annex C (normative)  Table of predefined themes .71
Annex D (informative)  TeleWeb document type definition (DTD) .78
Annex E (informative)  TeleWeb default CSS2 style sheet .87
Annex F (normative)  Font metrics.90
Annex G (informative) TeleWeb Superteletext profile reference decoder .95

Bibliography .98

Table 1 – Default colour palette .10
Table 2 – Font sizes .11
Table 3 – File naming .15
Table 4 – EPG parameters.17
Table 5 – Profile parameter.18
Table 6 – Special function URLs .20
Table 7 – List of service-related attributes .58
Table 8 – List of file-related attributes .59
Table 9 – Rating scheme .62
Table 10 – Filter attributes for nexTView references .65
Table A.1 – HTML V3.2 tags not supported .66
Table A.2 – HTML V3.2 attributes not supported.67
Table A.3 − Browser specific tags supported .67
Table A.4 – TeleWeb specific tags supported .67
Table B.1 – Default colour palette specification .69
Table C.1 – Predefined themes .71

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– 4 – 62298-3  IEC:2005(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

TELEWEB APPLICATION –

Part 3: Superteletext 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 standardization 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 with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62298-3 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
This standard cancels and replaces IEC/PAS 62298 published in 2002.
This first edition constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
100/924/FDIS 100/962/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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62298-3  IEC:2005(E) – 5 –
IEC 62298 consists of the following parts, under the general title TeleWeb application:
Part 1: General description
Part 2: Delivery methods
Part 3: Superteletext profile
Part 4: Hyperteletext profile (in preparation)

The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date T indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.

A bilingual version of this publication may be issued at a later date.

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– 6 – 62298-3  IEC:2005(E)
INTRODUCTION
The aim of TeleWeb is to deliver World Wide Web-style content to the living-room TV to give
the viewer an enhanced television experience. A TeleWeb service broadcasts data files
containing text and high-definition graphics to suitable decoders. The data transmitted can be
closely linked to events within the accompanying TV programs or can be more general in
nature to emulate a traditional, but higher definition, superteletext service. Different profiles
are defined.
It is intended that TV-based decoders can be implemented in a cost-effective manner without
recourse to the technology normally associated with personal computers. In part, this is
achieved by limiting the number of different types of multimedia data that can be used within a
service. By careful design of the user interface, decoder manufacturers will be able to offer
easy-to-use equipment for accessing TeleWeb services without requiring the consumer to be
computer-literate. In addition, they will be able to customize their products to differentiate
them from those of their competitors.
This standard specifies the TeleWeb Superteletext profile and focuses on the presentation
layer especially the implementation of TeleWeb HTML. It further defines graphical
requirements like colours and fonts and the content formats used.

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62298-3  IEC:2005(E) – 7 –
TELEWEB APPLICATION –

Part 3: Superteletext profile



1 Scope
This part of IEC 62298 specifies the TeleWeb Superteletext profile that allows Web-style text
and graphics to be displayed on suitable decoders. A TeleWeb service comprises multimedia
data files whose format and attributes are defined by this specification. This specification
focuses on the presentation layer especially the implementation of TeleWeb HTML. It further
defines graphical requirements like colours and fonts and the used content formats. For
information regarding general information and the transport layer, refer to IEC 62298-1 and
IEC 62298-2.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 62297-1, Triggering messages for broadcast applications T
ISO 639-2, Codes for the representation of names and languages – Part 2: Alpha-3 code
ISO 8601, Data elements and interchange formats – Information interchange –
Representation of dates and times
ISO 8859-1:1998, Information technology – 8-bit single-byte coded graphic character sets –
Part 1: Latin alphabet No. 1
ETSI TR 101 231, Television systems; Register of Country and Network Identification (CNI),
Video Programming System (VPS) codes and Application codes for Teletext based systems
ETSI EN 300 231, Television systems; Specification of the domestic video Program Delivery
Control (PDC) system
ETSI EN 300 468, Digital Video Broadcasting (DVB); Specification for Service Information (SI)
in DVB systems
ETSI EN 300 706, Enhanced Teletext Specification
ETSI EN 300 707, Electronic Program Guide (EPG); Protocol for a TV Guide using electronic
data transmission

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– 8 – 62298-3  IEC:2005(E)
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
button
part of the user interface that enables the viewer to select a page or trigger an event, etc. It
may not necessarily exist as a physical button on a remote control handset
3.1.2
CDATA
character data in an HTML document. Character entities and HTML mark-up is not recognized
3.1.3
conditional access (CA)
mechanism by which user access to service components can be restricted
3.1.4
PCDATA
Parsed character data in an HTML document. Character entities (numeric and named entities)
as well as HTML mark-up are recognized in the data
3.1.5
signed_integer
positive or negative integer value, in decimal notation. The first digit is preceded by a
mandatory plus (+) or minus (–) symbol with no white space between the symbol and the first
digit
3.1.6
text_string
sequence of displayable Latin-1 characters
3.1.7
unsigned_integer
integer value, in decimal notation, without a preceding plus (+) or minus (-) symbol
3.2 Abbreviations
ASCII American Standard Code for Information Interchange
CA Conditional Access
CDATA Character Data
CRC Cyclic Redundancy Check
DTD Document Type Definition
DVB Digital Video Broadcasting
ETS European Telecommunication Standard
GIF Graphics Interchange Format
HTML Hyper Text Mark-up Language
JFIF JPEG File Interchange Format
JPEG Joint Picture Experts Group
LSB Least Significant Bit

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62298-3  IEC:2005(E) – 9 –
MJD Modified Julian Date
MSB Most Significant Bit
PCDATA Parsed Character Data between tags
RFC Request For Comments
URL Uniform Resource Locator
UTC Universal Time Coordinated
WWW World Wide Web
4 Display
This clause defines the minimum requirements of a TeleWeb display. They are applicable to
both editing stations and decoders.
4.1 Colour representation
4.1.1 General requirements
A decoder shall be able to display each pixel on the text/graphics, background image and
background colour planes in a different colour from a palette of at least 188 colours. Full
transparency and one-level semi-transparency to video shall also be supported.
A decoder may be implemented with either a true-colour store or an indexed colour system.
To accommodate the latter type of decoder and to define a palette for GIF images that do not
specify a palette themselves, a single 188 colour palette is defined in 4.1.5. As a minimum,
the text/graphics, background image and background colour planes shall be able to support
colours subjectively equivalent to these colours. Content can be authored using other colours,
but authors should be aware that some decoders may not be able to reproduce them exactly
and may map such a colour to the closest match in the pre-defined colour palette.
For authoring purposes the text/graphics, background image and background colour planes
shall support at least 188 colours on the screen at any one time. In practical terms, a decoder
is likely to be able to display at least 256 colours, giving the equipment manufacturers at least
68 colours for their user interface.
To get an optimal display, the content should be authored using the TeleWeb default colour
palette. The response of a decoder is not defined by this specification if the colours used are
not all taken from the pre-defined colour palette. Under these circumstances, colour dithering
or matching techniques may need to be applied and the response of decoders may differ.
4.1.2 Colour resolution
Each colour shall be defined by red, green and blue (RGB) components or by a colour
constant (see 6.2.5.1).
The authored content shall define colours as 24-bit values, i.e. 8 bits for each component in
the order R, G, B.
A decoder is required to have a colour resolution of at least 4 bits per component (12 bits
minimum overall).
4.1.3 Gamma
Decoders shall assume that all RGB values defined and invoked by authored content have
been gamma pre-corrected for the eye.

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– 10 – 62298-3  IEC:2005(E)
4.1.4 Transparency
Decoders are required to implement a minimum of three levels of transparency – opaque,
semi-transparency and completely transparent.
The colour palette is optimized for 30 % semi-transparency. Where the decoder cannot
implement the value of 30 % semi-transparency, it shall replace it with the nearest value of
semi-transparency it can implement. If the encoded value of transparency is in the range
between 10 % and 90 %, it shall not be approximated as either 0 % or 100 % transparency.
So, 9 % may be approximated as 0 % but 10 % shall be represented with a value in the range
10 % to 90 % such as 30 %. Similarly, 91 % may be approximated as 100 %.
4.1.5 Colour palette
The predefined set of 188 colours is shown in Table 1 and in Annex B. The colours chosen
have a perceptually uniform distribution over the colour space. A service provider may choose
to author content using only this set of colours.
As a minimum, a decoder shall support these colours up to its resolution limit. It is then the
responsibility of the decoder to map the colours defined within the authored content to their
closest approximation within the predefined set.
Table 1 – Default colour palette
Transparency Total number Quantization Quantization Quantization
level of entries levels for red levels for green levels for blue
0 % 135 5 levels: 9 levels: 3 levels:
(fully opaque) 0, 63, 127, 191,
...