![]() ![]() For EPUB 3, the version string is supplied within a meta element in the Package Document for the book asset. Providing a book asset with a version string is what makes a versioned book. “latest” applies to the in-flight version if there is one, and otherwise the live version. “in-flight” applies to the version that is being or has been submitted, but has not yet gone live. “live” applies to the version currently on Apple Books, which could be the original or a later version. “versioned book” refers to a book asset that has been revised with a version string or in process of being revised. You can make an "unversioned" book "versioned" by uploading an asset that declares its version string. “unversioned” refers to a book that has not had versioning applied in the asset, for example, a book asset that was delivered to Apple Books before versioning was available. ![]() The following terms are used throughout this document to describe the various stages of a book: ![]() See Apple Books Metadata XML File Annotated in the Apple Books Book Package Specification for details on the tag. Note: Although EPUB 2 books cannot have an explicit version number, you can let customers know there is an update available by supplying text using the tag. The text will only be seen by the reader in the context of the popup. Id="myNote" that matches the value of the href attribute in the link that references itīecause the element has an epub:type of footnote, the text is hidden in the main body of the book. The element that contains the popup's text also has two attributes: In the example below, the anchor element ( ) has two attributes: epub:type="noteref" and a link that references the location of the element that contains the popup's text. Both elements have an epub:type attribute to identify their purpose: epub:type="noteref" to trigger the popup and epub:type="footnote" to indicate the footnote’s text. You use two elements to create a pop-up footnote: an anchor ( ) element that triggers the popup and the element that contains the footnote text. In EPUB 3 Flowing and Fixed Layout books, you can create pop-up footnotes by labeling footnotes with the appropriate epub:type values. For a full listing of the values available for epub:type, see. Within the Landmarks block, there can be only one epub:type attribute of each type for example, there cannot be multiple epub:type attributes of type "bodymatter". Apple suggests you label the first chapter of the book with an epub:type value of "bodymatter", with all other epub:type attributes tagged with the appropriate type ( "toc", "titlepage", "epilogue", "preface", and so on). ![]() The value for the epub:type attribute is case-sensitive. The required epub:type attribute describes the publication component referenced by the href attribute. Apple recommends you identify all of the key files in your book. The Landmarks structure uses the epub:type attribute to identify both the element and the document functions listed within it. Within the package, only one "landmarks" nav element can be delivered. If that value is not specified in the Landmarks navigation structure, Apple Books opens to the first spine item that contains one of the following epub:type landmarks values: Apple Books opens to the first landmark item that contains the epub:type value of "ibooks:reader-start-page". Landmarks can also be used to define the start page of a Flowing book, which is the first page a reader will see the first time they open a book. A Landmarks nav is required for Fixed Layout books if you do not provide a custom sample. Apple Books references the Landmarks when cutting the sample for a book. The Landmarks navigation structure replaces EPUB 2's element. It is created using a nav element with an epub:type value of "landmarks". The Landmarks structure identifies key component files within the book, such as the cover page, bibliography, and so on.
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