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Digital Replica Plus

Digital Replica Plus. 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

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Digital Replica Plus

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  1. Digital Replica Plus

  2. 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

  3. 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

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

  5. 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.

  6. 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.

  7. 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)

  8. 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)

  9. 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

  10. 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

  11. 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

  12. Thank You!

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