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Digital Replica Plus

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History and Motivation

• Derived from PDF-based print workflows• Minimal overhead for publishers• Semi-automatic tool for creation• No browser needed• Predictable, fast render times

› Direct GPU utilization, direct HW image decoding

• “Readability” through article view› … and a basis for Accessiblity

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Two “Renditions”

• The page images and the articles• Articles are pointed at by the OPF• Images are “known” via file structure &

presence of the Replica Map• Not a great solution, but…• All of the problems we solved are very real

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ReplicaMap Motivations

• Mapping Between Two Renditions• List of Hot-spots• Metadata On Spine Items• Alternate Linear Flows

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Mapping Between Two Renditions - Magazines

• Rendition 1: an image per 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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A List of Hot Spots- 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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Metadata On Spine Items - 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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Alternate Flows - Comics

• On small screen devices, fixed-size rendered 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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Observations

• 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

› But can be (and in our case, are) bi-directional

• Overlays are easy, because› The basis is fixed

• We strongly favor declarative markup that informs the user experience over embedding the UX in (e.g.) JavaScript

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More Observations

• WoodWing, Adobe and others have created non-ePub-based fixed formats› Adobe’s .folio format appears closed and proprietary› WoodWing converging on .folio (abandoning the

open “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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Futures & Recommendations

• Formalize replica map and call it Rendition Map› Fix the “bug” in CFIs that prevent them from

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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Thank You!