OCF201draft.docx

OCF201draft.docx

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OCF201draft

OpenContainerFormat（OCF）2.0.1v1.0

WORKINGDRAFTSPECIFICATIONMay9,2010

Thisversion

http:

//www.idpf.org/doc_library/epub/OCF_2.0.1_draft.doc

Latestversion

http:

//www.idpf.org/doc_library/epub/OCF_2.0_latest.doc

Previousversion

http:

//www.idpf.org/ocf/ocf1.0/download/ocf10.htm

Diffstopreviousversion

http:

//www.idpf.org/doc_library/epub/OCF_2.0.1_diffs_to_2.0.doc

Copyright©2010byInternationalDigitalPublishingForum™.

Allrightsreserved.ThisworkisprotectedunderTitle17oftheUnitedStatesCode.ReproductionanddisseminationofthisworkwithchangesisprohibitedexceptwiththewrittenpermissionoftheInternationalDigitalPublishingForum.

TABLEOFCONTENTS

TABLEOFCONTENTSii

1Overview1

1.1PurposeandScope1

1.2Definitions1

1.3RelationshiptoOtherSpecifications3

1.4Conformance4

1.4.1ConformingContainers4

1.4.2ConformingReadingSystems4

1.5Accessibility5

1.6FutureDirections5

2OCFOverview6

2.1OCF:

AGeneralContainerTechnology6

2.2“AbstractContainer”vs.“PhysicalContainer”6

2.3Examples6

2.3.1ExampleofasimplePublication,AbstractContainer,andZIPContainer6

2.3.2Single-publicationcontainers,butwithalternaterenditions8

3OCFContainerContents9

3.1Fileanddirectorystructure9

3.2RelativeIRIsforreferencingothercomponents9

3.3FileNames10

3.4Containermediatypeidentification11

3.5META-INF11

3.5.1Container–META-INF/container.xml（Required）11

3.5.2Manifest–META-INF/manifest.xml（Optional）13

3.5.3Metadata–META-INF/metadata.xml（Optional）14

3.5.4DigitalSignatures–META-INF/signatures.xml（Optional）14

3.5.5Encryption–META-INF/encryption.xml（Optional）15

3.5.6RightsManagement–META-INF/rights.xml（Optional）17

4ZIPContainer17

APPENDIXA:

RELAXNGOCFSchema19

APPENDIXB:

Example20

APPENDIXC:

CONTRIBUTORS24

Overview

Thisspecification,theOpenContainerFormat（OCF）,isonethirdofatriumvirateofmodularspecificationsthatmakeuptheEPUBpublicationformat.EPUBenablesthecreationandtransportofreflowabledigitalbooksandothertypesofcontentassingle-filedigitalpublicationsthatareinteroperablebetweendisparateEPUB-compliantreadingdevicesandapplications.EPUBencompassesacontentmarkupstandard（OpenPublicationStructure–OPS）,apackagingstandard（OpenPackagingFormat–OPF）,andthisspecification,acontainerstandard.

PurposeandScope

ThisspecificationdefinestheOpenContainerFormat（OCF）.OCFisageneral-purposecontainertechnology.Thisspecificationdescribesthegeneral-purposecontainertechnologyinthecontextofencapsulatingEPUBpublicationsandOPTIONALalternaterenditionsthereof.Itishoweveranticipatedthatthegeneral-purposecontainertechnologydescribedhereinmayultimatelybeusedinotherbundlingapplications.

Asageneralcontainerformat,OCFcollectsarelatedsetoffilesintoasingle-filecontainer.OCFcanbeusedtocollectfilesinvariousdocumentformatsandforclassesofapplications.Thesingle-filecontainerenableseasytransportof,managementof,andrandomaccessto,thecollection.

OCFdefinestherulesforhowtorepresentanabstractcollectionoffiles（the“abstractcontainer”）intophysicalrepresentationwithinaZIParchive（the“physicalcontainer”）.TherulesforZIPcontainersbuilduponandarebackwardcompatiblewiththeZIPtechnologiesusedbyOpenDocumentFormat（ODF）1.0.

OCFistheREQUIREDsingle-filecontainertechnologyforEPUBpublications.OCFMAYplayaroleinthefollowingworkflows:

Duringthepreparationstepsinproducinganelectronicpublication,OCFisusedasthesingle-fileformatwhenexchangingin-progresspublicationsbetweendifferentindividualsand/ordifferentorganizations.

Whenprovidinganelectronicpublicationfrompublisherorconversionhouse（ContentProvider）tothedistributionorsaleschannel,OCFistheRECOMMENDEDsingle-fileformattobeusedasthetransportformat.

WhendeliveringthefinalpublicationtoanEPUBReadingSystemorend-user,OCFistheREQUIREDformatforthesingle-filecontainerthatholdsalloftheassetsthatmakeupthepublication.

Definitions

ASCII

AmericanStandardCodeforInformationInterchange–a7-bitcharacterencodingbasedontheEnglishalphabet（ANSIX3.4-1986）.Whenusedinthisdocument,ASCIIreferstotheprintablegraphiccharactersintherange33（decimal）through126（decimal）andthenonprintablespacecharacter32（decimal）.

ContentProvider

Apublisher,author,individual,orotherinformationsourcethatprovidesapublicationtodistributionorsaleschannelsordirectlytooneormoreEPUBReadingSystemsusingOCFasdescribedinthisspecification.

EPUB

ThepublicationformatasdefinedbytheOCF2.0.1,OPF2.0.1andOPF2.0.1specifications.

EPUBPublication

AcollectionofOPSDocuments,anOPFPackagefile,andotherfiles,typicallyinavarietyofmediatypes,includingstructuredtextandgraphics,packagedinanOCFcontainerthatconstituteacohesiveunitforpublication,asdefinedbytheEPUBstandards.

EPUBReadingSystem（orReadingSystem）

Acombinationofhardwareand/orsoftwarethatacceptsEPUBPublicationsandmakesthemavailabletoconsumersofthecontent.GreatvarietyispossibleinthearchitectureofReadingSystems.AReadingSystemMAYbeimplementedentirelyononedevice,oritMAYbesplitamongseveralcomputers.Inparticular,areadingdevicethatisacomponentofaReadingSystemneednotdirectlyacceptOCF-PackagedEPUBPublications,butallReadingSystemsMUSTdoso.ReadingSystemsMAYincludeadditionalprocessingfunctions,suchascompression,indexing,encryption,rightsmanagement,anddistribution.

IRI

InternationalizedResourceIdentifier（http:

//www.ietf.org/rfc/rfc3987.txt）.

OCF

TheOpenContainerFormatdefinedbythisspecification.

OCFContainer

Acontainerfilethatiscompliantwiththeformatdefinedinthisspecification.

ODF

OpenDocumentFormat（http:

//www.oasis-open.org/committees/download.php/12572/OpenDocument-v1.0-os.pdf）.

OPF

OpenPackagingFormat（http:

//www.idpf.org/doc_library/epub/OPF_2.0.1_draft.htm）.

OPFPackage

AnXMLdocumentthatdescribestheOPScontentsofanEPUBPublicationprovidingmetadata,manifest,reading-orderandnavigationinformationforthepublication.

OPS

OpenPublicationStructure（http:

//www.idpf.org/doc_library/epub/OPS_2.0.1_draft.htm）.

OPSDocument

AnXMLdocumentthatconformstotheOPS2.0.1specification–generallycontainingthetextualcontentofanEPUBPublication.

MIME

MultipurposeInternetMailExtensions（http:

//www.isi.edu/in-notes/rfc2045.txt）.“MIMEmediatypes”provideastandardmethodologyforspecifyingthecontenttypeofobjects.

RFC

Literally“RequestForComments”,butmoregenerallyadocumentpublishedbytheInternetEngineeringTaskForce（IETF）.Seehttp:

//www.ietf.org/rfc.html.

ReadingSystem

SeeEPUBReadingSystem.

RelaxNG

AschemalanguageforXML（http:

//www.relaxng.org/）.

Rootfile

Thetop-levelfileofarenditionofapublication;eitherthe“root”fromwhichallothercomponentscanbefoundorthelonefileencapsulatingtherendition.TheEPUBrootfileistheOPFPackagefile.APDFfilecontainingthePDFrenditioncouldalsobearootfile.

XML

ExtensibleMarkupLanguage（http:

//www.w3.org/TR/2006/REC-xml-20060816/）.

ZIP

Adefactoindustrystandardbundlingandcompressionformat（

RelationshiptoOtherSpecifications

Thisspecificationcombinessubsetsandapplicationsofotherspecifications.Together,thesefacilitatetheconstruction,organization,presentation,andunambiguousinterchangeofelectronicdocuments:

1.TheXML1.0ExtensibleMarkupLanguagespecification（FourthEdition）（http:

//www.w3.org/TR/2006/REC-xml-20060816/）;and

2.TheOPF2.0.1OpenPackagingFormatspecification（http:

//www.idpf.org//doc_library/epub/OPF_2.0.1_draft.htm）;and

3.TheOPS2.0.1OpenPublicationStructurespecification（http:

//www.idpf.org/doc_library/epub/OPS_2.0.1_draft.htm）;and

4.TheXML1.0namespacespecification（SecondEdition）（http:

//www.w3.org/TR/2006/REC-xml-names-20060816/）;and

5.TheUnicodeStandard,Version4.0.Reading,Mass.:

Addison-Wesley,2003,asupdatedfromtimetotimebythepublicationofnewversions.（Seehttp:

//www.unicode.org/unicode/standard/versionsforthelatestversionandadditionalinformationonversionsofthestandardandoftheUnicodeCharacterDatabase）.;and

6.ParticularMIMEmediatypes（http:

//www.ietf.org/rfc/rfc4288.txtandhttp:

//www.iana.org/assignments/media-types/index.html）;and

7.OpenDocumentFormatforOfficeApplications（OpenDocument）v1.0（http:

//www.oasis-open.org/committees/download.php/12572/OpenDocument-v1.0-os.pdf）;and

8.ZIPformat（and

9.XML-SignatureSyntaxandProcessing（http:

//www.w3.org/TR/2002/REC-xmldsig-core-20020212）;and

10.XMLEncryptionSyntaxandProcessing（http:

//www.w3.org/TR/2002/REC-xmlenc-core-20021210）.

11.WebContentAccessibilityGuidelines1.0（http:

//www.w3.org/TR/WCAG10/）.

EPUBReadingSystemsMAYsupportXML1.1,butthisfeatureisdeprecatedinversion2.0.1（infavorofXML1.0）.SupportforXML1.1willberemovedinthenextversionofthespecification.

Conformance

Thekeywords"MUST","MUSTNOT","REQUIRED","SHALL","SHALLNOT","SHOULD","RECOMMENDED","MAY",and"OPTIONAL"inthisdocumentMUSTbeinterpretedasdescribedin（http:

//www.ietf.org/rfc/rfc2119.txt）.

ThissectiondefinesconformancerequirementsforOCF.

ConformingContainers

Theterm“ConformingOCFAbstractContainer”indicatesanOCFAbstractContainer（SeeSection2.2）thatconformstoalloftherelevantconformancecr