The one thing you will see in common with ALL of such graphics and markup proposals is LIMITED DISTRIBUTION as a way of life. The purpose of each one of these is and always has been to keep knowledge in the hands of the few and away from the minds of the many.
I predict that in the not-too-distant-future that all materials will either be circulating on the Internet, or that they will be jealously guarded by owners whom I described with the Seven Deadly Sins.
If there is ever such a thing as the "Tri-corder," of Star Trek fame, I am sure there simultaneously has to be developed a "safe" in which those who don't want a whole population to have what they have will "lock" a valuable object to ensure its uniqueness; the concept of which I am speaking is illustrated by this story:
"A butler announces a delivery, by very distinguished members of a very famous auction house. The master— for he IS master—beckons him to his study desk where the butler deposits his silver tray, containing a big triangular stamp, then turns to go.
What some of these projects with tens of millions for their "Electronic Libraries" are doing to ensure this is for THEM and not for everyone is to prepare Etexts in a manner in which no normal person would either be willing or able to read them.
Shakespeare's Hamlet is a tiny file in PVASCII, small enough for half a dozen copies to fit [uncompressed!] on a $.23 floppy disk that fits in your pocket. But, if it is preserved as a PICTURE of each page, then it will take so much space that it would be difficult to carry around even a single copy in that pocket unless it were on a floppy sized optical disk, and even then I don't think it would fit.
Another way to ensure no normal person would read it, to mark it up so blatantly that the human eyes should have difficulty in scansion, stuttering around pages, rather than sliding easily over them; the information contained in this "markup" is deemed crucial by those esoteric scholars who think it is of vital importance that a coffee cup stain appears at the lower right of a certain page, and that "Act I" be followed by [<ACT ONE>] to ensure everyone knows this is actually where this is where an act or scene or whatever starts.
You probably would not believe how much money has had the honor of being spent on these kinds of projects a normal person is intentionlly deprived of through the mixture is just plain HIDING the files, to making the files so BIG you can't download them, to making them so WEIRD you wouldn't read them if you got them. The concept of requiring all documents to be formatted in a certain manner such that only a certain program can read them has been proposed more often then you might ever want to imagine, for the TWIN PURPOSES OF PROFIT AND LIMITED DISTRIBUTION in a medium which requires a virtue of UNLIMITED DISTRIBUTION to keep it growing.
Every day I read articles, proposals, proceedings for various conferences that promote LIMITED DISTRIBUTION on the Nets. . .simply to raise the prestige or money to keep some small oligarchy in power.
This is truly a time of POWER TO THE PEOPLE as people say in the United States.