Redefining Multichannel Content Publishing
The "ah-ha" moment came as the group worked to extend the pam:media model to handle the new, complex multimedia objects found in tablet editions. Peter Meirs challenged the group by posing the question, "Should we be modeling media objects in XHTML, or should we base nextPub on next-generation HTML5 so we can just stand back and let HTML5 do what HTML can do?"
Following this discussion, the nextPub Working Group held a number of meetings, drawing in technologists from both the publishers and solutions provider sides to explore the feasibility and real-world practicality of basing nextPub source content encoding on HTML5. HTML5 is gaining credibility as a delivery platform for publications, not only on the Web, but also as an alternative to the publication apps that we see today on tablets and smart phones. With EPUB 3 incorporating HTML5 as its base content format, it makes greater sense to bring nextPub Source XML into as close compliance with the XML Serialization of HTML5 as is possible, while still retaining sufficiently rich source semantics.
So, the decision has been made that nextPub XML Source will move from today's PRISM/PAM XML, based on XHTML, to a format that allows for expanded PRISM 3.0-based metadata in the nextPub metadata block, while moving to an HTML5-compliant head and body for content encoding.
The nextPub Source Content XML Model
The nextPub XML Source Content Model combines PRISM metadata fields along with a parsable subset of HTML5 for encoding the publication content.
The nextPub metadata block provides several key components to managing source content for aggregation, transformation and delivery. Use cases that informed this structure defined the ability to aggregate content into magazines and books as they are produced today, while developing new collections of content that are customized to a region or target audience. For example, it should be feasible to create an annual collection of cartoons from a magazine title, or even across magazine titles from a single publisher. Likewise it should be possible to build new products that draw content from a particular author, celebrity or subject matter.