Data Layer (Model)
The content in it's domain specific structure.
Model, View, Controller
View
Presentation Layer
Defines how to represent the content (as chapters, paragraphs, tables, lists,...).
Presentation Blocks
Presentation elements that belong together. They only make sense together.
Format Layer
 XSL-FO
Extensible Stylesheet Language (XSL) - Formating Objects (FO) to render page oriented formats.
Styling Layer
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