Authors should use
spine itemref overrides [Publications301] to indicate the fixed - layout properties of EPUB Content Documents, as these are more directly tied to the documents (i.e., they can be looked up and translated without a complex system of comparisons, additions, subtractions and overrides).
The page - spread - * property allows you to specify which viewport
a spine itemref element will appear on.
The rendition: orientation - landscape, rendition: orientation - portrait and rendition: orientation - auto properties [Rendition Vocab] may be specified locally on
spine itemref elements, and will, in such cases, override the global value for the given spine item.
For Foreign Resources referenced directly from
spine itemref elements, the chain must contain at least one EPUB Content Document.
The rendition: flow - auto, rendition: flow - paginated, rendition: flow - scrolled - continuous and rendition: flow - scrolled - doc properties [Rendition Vocab] may be specified locally on
spine itemref elements, and will, in such cases, override the global value for the given spine item.
By providing one of the rendition: page - spread - left, rendition: page - spread - right or rendition: page - spread - center properties [Rendition Vocab] on
a spine itemref element, an Author may override this automatic population behavior by forcing that document to be placed in a particular viewport.
The rendition: spread - landscape, rendition: spread - both, rendition: spread - auto and rendition: spread - none properties [Rendition Vocab] may be specified locally on
spine itemref elements, and will, in such cases, override the global value for the given spine item.
So if you have two
spine itemref elements that make up a single image that should be appear across a spread, you can define the one that should be on the left as page - spread - left and the one that should appear on the right as page - spread - right.
Foreign Resources may be included in an EPUB Publication without a fallback provided they are not referenced from
spine itemref elements [Packages 3.1] or directly rendered in their native format in EPUB Content Documents (e.g., via [HTML] embedded content and [SVG] image and foreignObject elements).
The new properties attribute on the Package Document manifest item and
spine itemref elements allows for the declaration of metadata about individual Publication Resources.
Refer to Manifest item Properties [Publications30] and
Spine itemref Properties [Publications30] for more information.
The rendition: layout property may also be specified locally on the Package Document
spine itemref element, and will, in this case, override the global value for the given spine item.
In the context of the properties defined in this document, and when specifying property name - value pairs in the properties attribute on the Package Document
spine itemref element, the following syntax must be used.
The rendition: orientation property may also be specified locally on the Package Document
spine itemref element, and will, in this case, override the global value for the given spine item.
Reading Systems must produce exactly one page per
spine itemref when rendering.
Not exact matches
Using the same value as the id attribute for the XHTML cover, add an initial
itemref to the
spine element that refers to the cover page but is not linear.
A good rule of thumb is that the NCX often contains more navPoint elements than there are
itemref elements in the OPF
spine.
..., the Reading System should verify that the element has the ID matching chap01ref when processing element 4 (for this example, an
itemref in the
spine).
The child
itemref elements of the
spine represent a sequential list of Publication Resources (typically EPUB Content Documents).
When this property is used in the
spine within an
itemref, the property is defined immediately following the item id.
The EPUB
Spine Properties Vocabulary [
Spine Vocab] is defined to be the default vocabulary for the
itemref properties attribute.
If this property is used in the
spine within an
itemref, the property is defined immediately following the item id.
Allowed on: collection, dc: contributor, dc: coverage, dc: creator, dc: date, dc: description, dc: format, dc: identifier, dc: language, dc: publisher, dc: relation, dc: rights, dc: source, dc: subject, dc: title, dc: type, item,
itemref, link, manifest, meta, package and
spine.