Learning material is often created with the layout in mind first. This results in well-designed but "dumb" PDF's and makes displaying the content on mobile phones very difficult. That's why there is so much educational content, but little of it is digitally accessible.
That needs to change, don't you think?
This is why bitmark describes the meaning of the content, not what it looks like. Computers are so empowered to understand the learning material and make something useful of it: Provide individual learning paths, give the right feedback at the right time, and much more. Also, complex layout information is no longer required. Instead, the optimal display is enabled by the content's metadata. That's content-first.