Transcript drpMotivation - epub

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Digital Replica Plus
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Derived from PDF-based print workflows
Minimal overhead for publishers
Semi-automatic tool for creation
No browser needed
Predictable, fast render times
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Direct GPU utilization, direct HW image decoding
• “Readability” through article view
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… and a basis for Accessiblity
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History and Motivation
• The page images and the articles
• Articles are pointed at by the OPF
• Images are “known” via file structure &
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presence of the Replica Map
Not a great solution, but…
All of the problems we solved are very real
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Two “Renditions”
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Mapping Between Two Renditions
List of Hot-spots
Metadata On Spine Items
Alternate Linear Flows
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ReplicaMap Motivations
• Rendition 1: an image per
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page
Rendition 2: lightly styled
XHTML content of articles
ReplicaMap provides a list of
areas in Rendition 1 that link
to Rendition 2.
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Mapping Between Two Renditions - Magazines
In addition to mapping between
alternative renditions, hot-spots
on a particular page can provide
links to other information.
In this case – links to individual
video messages from the
editors.
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A List of Hot Spots- Magazines
A magazine generally contains a collection of
articles, and the articles have their own set of
metadata:
- Article Title (dc:title)
- Byline (dc:creator)
- Date (dc:date)
- Original Publication/Reprint Info
(Note: also applies to collection of short stories)
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Metadata On Spine Items - Magazines
• On small screen devices, fixed-size rendered
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pages may not be legible
One solution is to provide a set of regions to
zoom in on as a traversal of the content.
Example: A list of cells in a comic page.
Can be thought of as a mapping from one
rendition, back to itself (with a different set of
media constraints/selectors)
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Alternate Flows - Comics
• The key notion in Fixed Layout is “fixed”
› No dynamic layout
› Re-layout can cause a host of incompatibilities
› No font licensing issues
• The fixed rendition(s) is the basis
• Other renditions map onto the fixed version
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But can be (and in our case, are) bi-directional
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The basis is fixed
• Overlays are easy, because
• We strongly favor declarative markup that informs the
user experience over embedding the UX in (e.g.)
JavaScript
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Observations
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WoodWing, Adobe and others have created nonePub-based fixed formats
› Adobe’s .folio format appears closed and proprietary
› WoodWing converging on .folio (abandoning the open
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“OFIP” format?)
These are essentially images of pages, XML
describing a “spine” and related notions, and
overlays
Evolved ePub can and should encompass such
formats
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More Observations
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Formalize replica map and call it Rendition Map
› Fix the “bug” in CFIs that prevent them from
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referencing non-default renditions
Make multiple renditions useful
Images should be legal spine items
B&N is announcing, and will release to Open
Source, an InDesign plug-in to create “DRP”
directly, including “article mode”
Please see the IDPF Wiki for details on
RenditionMap and related thoughts and samples
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Futures & Recommendations
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Thank You!