ISO/IEC 23736-4:2020
(Main)Information technology — Digital publishing — EPUB 3.0.1 — Part 4: Open container format
Information technology — Digital publishing — EPUB 3.0.1 — Part 4: Open container format
This specification, EPUB Open Container Format (OCF) 3.0.1, defines a file format and processing model for encapsulating the set of related resources that comprise an EPUB® Publication into a single-file container. This specification is one of a family of related specifications that compose EPUB 3, the third major revision of an interchange and delivery format for digital publications based on XML and Web Standards. It is meant to be read and understood in concert with the other specifications that make up EPUB 3: The EPUB 3 Overview [EPUB3Overview], which provides an informative overview of EPUB and a roadmap to the rest of the EPUB 3 documents. The Overview should be read first. EPUB Publications 3.0.1 [Publications301], which defines the semantics and overarching conformance requirements for each Rendition of an EPUB Publication. EPUB Content Documents 3.0.1 [ContentDocs301], which defines profiles of XHTML, SVG and CSS for use in the context of EPUB Publications. EPUB Media Overlays 3.0.1 [MediaOverlays301], which defines a format and a processing model for synchronization of text and audio. OCF is the required container technology for EPUB Publications. OCF may play a role in the following workflows: During the preparation steps in producing an EPUB Publication, OCF may be used as the container format when exchanging an in-progress EPUB Publication between different individuals and/or different organizations. When providing an EPUB Publication from publisher or conversion house to the distribution or sales channel, OCF is the recommended container format to be used as the transport format. When delivering the final EPUB Publication to an EPUB Reading System or User, OCF is the required format for the container that holds all of the assets that make up the EPUB Publication. The OCF specification defines the rules for structuring the file collection in the abstract: the "abstract container". It also defines the rules for the representation of this abstract container within a ZIP archive: the "physical container". The rules for ZIP physical containers build upon the ZIP technologies used by [ODF]. OCF also defines a standard method for obfuscating embedded resources, such as fonts, for those EPUB Publications that require this functionality. This specification supersedes Open Container Format (OCF) 3.0 [OCF30]. Refer to [EPUB3Changes] for information on differences between this specification and its predecessor.
Technologies de l'information — Publications numériques — EPUB 3.0.1 — Partie 4: Format de conteneur ouvert
General Information
Buy Standard
Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 23736-4
First edition
2020-02
Information technology — Digital
publishing — EPUB 3.0.1 —
Part 4:
Open container format
Technologies de l'information — Publications numériques — EPUB
3.0.1 —
Partie 4: Format de conteneur ouvert
Reference number
©
ISO/IEC 2020
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non‐governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see http://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),
see www.iso.org/iso/foreword.html.
This document was prepared by the World Wide Web Consortium (W3C) [as EPUB Open
Container Format (OCF) 3.0.1] and drafted in accordance with its editorial rules. It was adopted,
under the JTC 1 PAS procedure, by Joint Technical Committee ISO/IEC JTC 1, Information technology.
A list of all parts in the ISO/IEC 23736 series can be found on the ISO websitte.e
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
© ISO/IEC 2020 – All rights reserved iii
EPUB Open Container Format (OCF) 3.0.1
Recommended Specification 26 June 2014
THIS VERSION
http://www.idpf.org/epub/301/spec/epub-ocf-20140626.html
LATEST VERSION
http://www.idpf.org/epub3/latest/ocf
PREVIOUS VERSION
http://www.idpf.org/epub/301/spec/epub-ocf-20140228.html
A diff of changes from the previous version is also available.
Please refer to the errata for this document, which may include some normative corrections.
All rights reserved. This work is protected under Title 17 of the United States Code. Reproduction and
dissemination of this work with changes is prohibited except with the written permission of the International
Digital Publishing Forum (IDPF).
EPUB is a registered trademark of the International Digital Publishing Forum.
Editors
James Pritchett, Learning Ally (formerly Recording for the Blind & Dyslexic)
Markus Gylling, International Digital Publishing Forum (IDPF)
TABLE OF CONTENTS
1. Overview
1.1. Purpose and Scope
1.2. Terminology
1.3. Typographic Conventions
1.4. Conformance Statements
1.5. Content Conformance
1.6. Reading System Conformance
2. OCF Abstract Container
2.1. Overview
2.2. File and Directory Structure
2.3. Relative IRIs for Referencing Other Components
2.4. File Names
2.5. META-INF
2.5.1. Container – META-INF/container.xml
2.5.2. Encryption – META-INF/encryption.xml
2.5.3. Manifest – META-INF/manifest.xml
2.5.4. Metadata – META-INF/metadata.xml
2.5.5. Rights Management – META-INF/rights.xml
2.5.6. Digital Signatures – META-INF/signatures.xml
3. OCF ZIP Container
© ISO/IEC 2020 – All rights reserved 1
3.1. Overview
3.2. ZIP File Requirements
3.3. OCF ZIP Container Media Type Identification
4. Resource Obfuscation
4.1. Introduction
4.2. Obfuscation Key
4.3. Obfuscation Algorithm
4.4. Specifying Obfuscated Resources
A. Schemas
A.1. Schema for container.xml
A.2. Schema for encryption.xml
A.3. Schema for signatures.xml
B. Example
C. The application/epub+zip Media Type
D. Acknowledgements and Contributors
References
› 1 Overview
› 1.1 Purpose and Scope
This section is informative
This specification, EPUB Open Container Format (OCF) 3.0.1, defines a file format and processing
model for encapsulating the set of related resources that comprise an EPUB® Publication into a
single-file container.
This specification is one of a family of related specifications that compose EPUB 3, the third major
revision of an interchange and delivery format for digital publications based on XML and Web
Standards. It is meant to be read and understood in concert with the other specifications that make up
EPUB 3:
The EPUB 3 Overview [EPUB3Overview], which provides an informative overview of EPUB and
a roadmap to the rest of the EPUB 3 documents. The Overview should be read first.
EPUB Publications 3.0.1 [Publications301], which defines the semantics and overarching
conformance requirements for each Rendition of an EPUB Publication.
EPUB Content Documents 3.0.1 [ContentDocs301], which defines profiles of XHTML, SVG and
CSS for use in the context of EPUB Publications.
EPUB Media Overlays 3.0.1 [MediaOverlays301], which defines a format and a processing
model for synchronization of text and audio.
OCF is the required container technology for EPUB Publications. OCF may play a role in the following
workflows:
During the preparation steps in producing an EPUB Publication, OCF may be used as the
container format when exchanging an in-progress EPUB Publication between different
individuals and/or different organizations.
When providing an EPUB Publication from publisher or conversion house to the distribution or
sales channel, OCF is the recommended container format to be used as the transport format.
2 © ISO/IEC 2020 – All rights reserved
When delivering the final EPUB Publication to an EPUB Reading System or User, OCF is the
required format for the container that holds all of the assets that make up the EPUB Publication.
The OCF specification defines the rules for structuring the file collection in the abstract: the "abstract
container". It also defines the rules for the representation of this abstract container within a ZIP
archive: the "physical container". The rules for ZIP physical containers build upon the ZIP
technologies used by [ODF]. OCF also defines a standard method for obfuscating embedded
resources, such as fonts, for those EPUB Publications that require this functionality.
This specification supersedes Open Container Format (OCF) 3.0 [OCF30]. Refer to [EPUB3Changes]
for information on differences between this specification and its predecessor.
› 1.2 Terminology
EPUB Publication
A collection of one or more Renditions conforming to this specification and its sibling
specifications , packaged in an EPUB Container.
An EPUB Publication typically represents a single intellectual or artistic work, but this
specification and its sibling specifications do not circumscribe the nature of the content.
Rendition
A logical document entity consisting of a set of interrelated resources representing one
rendering of an EPUB Publication.
Default Rendition
The Rendition listed in the first rootfile element in the container.xml file.
Publication Resource
A resource that contains content or instructions that contribute to the logic and rendering of
at least one Rendition of an EPUB Publication. In the absence of this resource, the EPUB
Publication might not render as intended by the Author. Examples of Publication Resources
include a Rendition's Package Document, EPUB Content Document, EPUB Style Sheets,
audio, video, images, embedded fonts and scripts.
With the exception of the Package Document itself, the Publication Resources required to
render a Rendition are listed in that Rendition's manifest [Publications301] and bundled in
the EPUB Container file (unless specified otherwise in Publication Resource Locations
[Publications301] ).
Examples of resources that are not Publication Resources include those identified by the
Package Document link [Publications301] element and those identified in outbound
hyperlinks that resolve outside the EPUB Container (e.g., referenced from an [HTML5] a
element href attribute).
EPUB Content Document
A Publication Resource that conforms to one of the EPUB Content Document definitions
(XHTML or SVG).
An EPUB Content Document is a Core Media Type, and may therefore be included in the
EPUB Publication without the provision of fallbacks [Publications301] .
XHTML Content Document
© ISO/IEC 2020 – All rights reserved 3
An EPUB Content Document conforming to the profile of [HTML5] defined in XHTML
Content Documents [ContentDocs301] .
XHTML Content Documents use the XHTML syntax of [HTML5].
SVG Content Document
An EPUB Content Document conforming to the constraints expressed in SVG Content
Documents [ContentDocs301] .
Core Media Type
A set of Publication Resource types for which no fallback is required. Refer to Publication
Resources [Publications301] for more information.
Package Document
A Publication Resource carrying bibliographical and structural metadata about a given
Rendition of an EPUB Publication, as defined in Package Documents [Publications301] .
Unique Identifier
The Unique Identifier is the primary identifier for an EPUB Publication, as identified by the
unique-identifier attribute. The Unique Identifier may be shared by one or many
Renditions of the same EPUB Publication that conform to the EPUB standard and embody
the same content.
The Unique Identifier is less granular than the ISBN. However, significant revision,
abridgement, etc. of the content requires a new Unique Identifier.
EPUB Style Sheet (or Style Sheet)
A CSS Style Sheet conforming to the CSS profile defined in EPUB Style Sheets
[ContentDocs301] .
Viewport
The region of an EPUB Reading System in which the content of an EPUB Publication is
rendered visually to a User.
EPUB Container (or Container)
The ZIP-based packaging and distribution format for EPUB Publications defined in OCF
ZIP Container .
OCF Processor
A software application that processes EPUB Containers according to this specification.
Root Directory
The root directory represents the base of the Abstract Container file system. This directory
is virtual in nature: a Reading System might or might not generate a physical root directory
for the contents of the Abstract Container if the contents are unzipped.
Author
The person(s) or organization responsible for the creation of an EPUB Publication, which is
not necessarily the creator of the content and resources it contains.
User
4 © ISO/IEC 2020 – All rights reserved
An individual that consumes an EPUB Publication using an EPUB Reading System.
EPUB Reading System (or Reading System)
A system that processes EPUB Publications for presentation to a User in a manner
conformant with this specification and its sibling specifications .
› 1.3 Typographic Conventions
The following typographic conventions are used in this specification:
markup
All markup (elements, attributes, properties), code (JavaScript, pseudo-code), machine
processable values (string, characters, media types) and file names are in red-orange
monospace font.
markup
Links to markup and code definitions are underlined and in red-orange monospace font. Only
the first instance in each section is linked.
http://www.idpf.org/
URIs are in navy blue monospace font.
hyperlink
Hyperlinks are underlined and in blue.
[reference]
Normative and informative references are enclosed in square brackets.
Term
Terms defined in the Terminology are in capital case.
Term
Links to term definitions have a dotted blue underline. Only the first instance in each section is
linked.
Normative element, attribute and property definitions are in blue boxes.
Informative markup examples are in white boxes.
NOTE
Informative notes are in yellow boxes with a "Note" header.
© ISO/IEC 2020 – All rights reserved 5
CAUTION
Informative cautionary note are in red boxes with a "Caution" header.
› 1.4 Conformance Statements
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, MAY,
and OPTIONAL in this document are to be interpreted as described in [RFC2119].
All sections of this specification are normative except where identified by the informative status label
"This section is informative". The application of informative status to sections and appendices applies
to all child content and subsections they may contain.
All examples in this specification are informative.
› 1.5 Content Conformance
›
An OCF Abstract Container MUST meet the conformance constraints defined in OCF Abstract
Container .
›
An OCF ZIP Container (also referred to as an EPUB Container) MUST meet the conformance
constraints defined in OCF ZIP Container .
› 1.6 Reading System Conformance
An EPUB Reading System MUST meet all of the following criteria:
›
It MUST process the OCF ZIP Container in con
...
INTERNATIONAL ISO/IEC
STANDARD 23736-4
First edition
2020-02
Information technology — Digital
publishing — EPUB 3.0.1 —
Part 4:
Open container format
Technologies de l'information — Publications numériques — EPUB
3.0.1 —
Partie 4: Format de conteneur ouvert
Reference number
©
ISO/IEC 2020
© ISO/IEC 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO/IEC 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non‐governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of document should be noted (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see http://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),
see www.iso.org/iso/foreword.html.
This document was prepared by the World Wide Web Consortium (W3C) [as EPUB Open
Container Format (OCF) 3.0.1] and drafted in accordance with its editorial rules. It was adopted,
under the JTC 1 PAS procedure, by Joint Technical Committee ISO/IEC JTC 1, Information technology.
A list of all parts in the ISO/IEC 23736 series can be found on the ISO websitte.e
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
© ISO/IEC 2020 – All rights reserved iii
EPUB Open Container Format (OCF) 3.0.1
Recommended Specification 26 June 2014
THIS VERSION
http://www.idpf.org/epub/301/spec/epub-ocf-20140626.html
LATEST VERSION
http://www.idpf.org/epub3/latest/ocf
PREVIOUS VERSION
http://www.idpf.org/epub/301/spec/epub-ocf-20140228.html
A diff of changes from the previous version is also available.
Please refer to the errata for this document, which may include some normative corrections.
All rights reserved. This work is protected under Title 17 of the United States Code. Reproduction and
dissemination of this work with changes is prohibited except with the written permission of the International
Digital Publishing Forum (IDPF).
EPUB is a registered trademark of the International Digital Publishing Forum.
Editors
James Pritchett, Learning Ally (formerly Recording for the Blind & Dyslexic)
Markus Gylling, International Digital Publishing Forum (IDPF)
TABLE OF CONTENTS
1. Overview
1.1. Purpose and Scope
1.2. Terminology
1.3. Typographic Conventions
1.4. Conformance Statements
1.5. Content Conformance
1.6. Reading System Conformance
2. OCF Abstract Container
2.1. Overview
2.2. File and Directory Structure
2.3. Relative IRIs for Referencing Other Components
2.4. File Names
2.5. META-INF
2.5.1. Container – META-INF/container.xml
2.5.2. Encryption – META-INF/encryption.xml
2.5.3. Manifest – META-INF/manifest.xml
2.5.4. Metadata – META-INF/metadata.xml
2.5.5. Rights Management – META-INF/rights.xml
2.5.6. Digital Signatures – META-INF/signatures.xml
3. OCF ZIP Container
© ISO/IEC 2020 – All rights reserved 1
3.1. Overview
3.2. ZIP File Requirements
3.3. OCF ZIP Container Media Type Identification
4. Resource Obfuscation
4.1. Introduction
4.2. Obfuscation Key
4.3. Obfuscation Algorithm
4.4. Specifying Obfuscated Resources
A. Schemas
A.1. Schema for container.xml
A.2. Schema for encryption.xml
A.3. Schema for signatures.xml
B. Example
C. The application/epub+zip Media Type
D. Acknowledgements and Contributors
References
› 1 Overview
› 1.1 Purpose and Scope
This section is informative
This specification, EPUB Open Container Format (OCF) 3.0.1, defines a file format and processing
model for encapsulating the set of related resources that comprise an EPUB® Publication into a
single-file container.
This specification is one of a family of related specifications that compose EPUB 3, the third major
revision of an interchange and delivery format for digital publications based on XML and Web
Standards. It is meant to be read and understood in concert with the other specifications that make up
EPUB 3:
The EPUB 3 Overview [EPUB3Overview], which provides an informative overview of EPUB and
a roadmap to the rest of the EPUB 3 documents. The Overview should be read first.
EPUB Publications 3.0.1 [Publications301], which defines the semantics and overarching
conformance requirements for each Rendition of an EPUB Publication.
EPUB Content Documents 3.0.1 [ContentDocs301], which defines profiles of XHTML, SVG and
CSS for use in the context of EPUB Publications.
EPUB Media Overlays 3.0.1 [MediaOverlays301], which defines a format and a processing
model for synchronization of text and audio.
OCF is the required container technology for EPUB Publications. OCF may play a role in the following
workflows:
During the preparation steps in producing an EPUB Publication, OCF may be used as the
container format when exchanging an in-progress EPUB Publication between different
individuals and/or different organizations.
When providing an EPUB Publication from publisher or conversion house to the distribution or
sales channel, OCF is the recommended container format to be used as the transport format.
2 © ISO/IEC 2020 – All rights reserved
When delivering the final EPUB Publication to an EPUB Reading System or User, OCF is the
required format for the container that holds all of the assets that make up the EPUB Publication.
The OCF specification defines the rules for structuring the file collection in the abstract: the "abstract
container". It also defines the rules for the representation of this abstract container within a ZIP
archive: the "physical container". The rules for ZIP physical containers build upon the ZIP
technologies used by [ODF]. OCF also defines a standard method for obfuscating embedded
resources, such as fonts, for those EPUB Publications that require this functionality.
This specification supersedes Open Container Format (OCF) 3.0 [OCF30]. Refer to [EPUB3Changes]
for information on differences between this specification and its predecessor.
› 1.2 Terminology
EPUB Publication
A collection of one or more Renditions conforming to this specification and its sibling
specifications , packaged in an EPUB Container.
An EPUB Publication typically represents a single intellectual or artistic work, but this
specification and its sibling specifications do not circumscribe the nature of the content.
Rendition
A logical document entity consisting of a set of interrelated resources representing one
rendering of an EPUB Publication.
Default Rendition
The Rendition listed in the first rootfile element in the container.xml file.
Publication Resource
A resource that contains content or instructions that contribute to the logic and rendering of
at least one Rendition of an EPUB Publication. In the absence of this resource, the EPUB
Publication might not render as intended by the Author. Examples of Publication Resources
include a Rendition's Package Document, EPUB Content Document, EPUB Style Sheets,
audio, video, images, embedded fonts and scripts.
With the exception of the Package Document itself, the Publication Resources required to
render a Rendition are listed in that Rendition's manifest [Publications301] and bundled in
the EPUB Container file (unless specified otherwise in Publication Resource Locations
[Publications301] ).
Examples of resources that are not Publication Resources include those identified by the
Package Document link [Publications301] element and those identified in outbound
hyperlinks that resolve outside the EPUB Container (e.g., referenced from an [HTML5] a
element href attribute).
EPUB Content Document
A Publication Resource that conforms to one of the EPUB Content Document definitions
(XHTML or SVG).
An EPUB Content Document is a Core Media Type, and may therefore be included in the
EPUB Publication without the provision of fallbacks [Publications301] .
XHTML Content Document
© ISO/IEC 2020 – All rights reserved 3
An EPUB Content Document conforming to the profile of [HTML5] defined in XHTML
Content Documents [ContentDocs301] .
XHTML Content Documents use the XHTML syntax of [HTML5].
SVG Content Document
An EPUB Content Document conforming to the constraints expressed in SVG Content
Documents [ContentDocs301] .
Core Media Type
A set of Publication Resource types for which no fallback is required. Refer to Publication
Resources [Publications301] for more information.
Package Document
A Publication Resource carrying bibliographical and structural metadata about a given
Rendition of an EPUB Publication, as defined in Package Documents [Publications301] .
Unique Identifier
The Unique Identifier is the primary identifier for an EPUB Publication, as identified by the
unique-identifier attribute. The Unique Identifier may be shared by one or many
Renditions of the same EPUB Publication that conform to the EPUB standard and embody
the same content.
The Unique Identifier is less granular than the ISBN. However, significant revision,
abridgement, etc. of the content requires a new Unique Identifier.
EPUB Style Sheet (or Style Sheet)
A CSS Style Sheet conforming to the CSS profile defined in EPUB Style Sheets
[ContentDocs301] .
Viewport
The region of an EPUB Reading System in which the content of an EPUB Publication is
rendered visually to a User.
EPUB Container (or Container)
The ZIP-based packaging and distribution format for EPUB Publications defined in OCF
ZIP Container .
OCF Processor
A software application that processes EPUB Containers according to this specification.
Root Directory
The root directory represents the base of the Abstract Container file system. This directory
is virtual in nature: a Reading System might or might not generate a physical root directory
for the contents of the Abstract Container if the contents are unzipped.
Author
The person(s) or organization responsible for the creation of an EPUB Publication, which is
not necessarily the creator of the content and resources it contains.
User
4 © ISO/IEC 2020 – All rights reserved
An individual that consumes an EPUB Publication using an EPUB Reading System.
EPUB Reading System (or Reading System)
A system that processes EPUB Publications for presentation to a User in a manner
conformant with this specification and its sibling specifications .
› 1.3 Typographic Conventions
The following typographic conventions are used in this specification:
markup
All markup (elements, attributes, properties), code (JavaScript, pseudo-code), machine
processable values (string, characters, media types) and file names are in red-orange
monospace font.
markup
Links to markup and code definitions are underlined and in red-orange monospace font. Only
the first instance in each section is linked.
http://www.idpf.org/
URIs are in navy blue monospace font.
hyperlink
Hyperlinks are underlined and in blue.
[reference]
Normative and informative references are enclosed in square brackets.
Term
Terms defined in the Terminology are in capital case.
Term
Links to term definitions have a dotted blue underline. Only the first instance in each section is
linked.
Normative element, attribute and property definitions are in blue boxes.
Informative markup examples are in white boxes.
NOTE
Informative notes are in yellow boxes with a "Note" header.
© ISO/IEC 2020 – All rights reserved 5
CAUTION
Informative cautionary note are in red boxes with a "Caution" header.
› 1.4 Conformance Statements
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, MAY,
and OPTIONAL in this document are to be interpreted as described in [RFC2119].
All sections of this specification are normative except where identified by the informative status label
"This section is informative". The application of informative status to sections and appendices applies
to all child content and subsections they may contain.
All examples in this specification are informative.
› 1.5 Content Conformance
›
An OCF Abstract Container MUST meet the conformance constraints defined in OCF Abstract
Container .
›
An OCF ZIP Container (also referred to as an EPUB Container) MUST meet the conformance
constraints defined in OCF ZIP Container .
› 1.6 Reading System Conformance
An EPUB Reading System MUST meet all of the following criteria:
›
It MUST process the OCF ZIP Container in con
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Questions, Comments and Discussion
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