It should be able to make it accessible by degrading gracefully.
Example, you can make a CSS or XSLT stylesheet that is only visible for disabled people. It is invisible for the ordinary surfer.
Digital books and documents have one very great advantage compared to paper books ( at least in 2008 ).
You can transclude a cite directly in your document / eBook. That cite my get another colour, so it is evident that it is embedded from another source.
XLink and XPointer are among other things designed to support
true transclusion.
Clicking that cite redirects you to the original source. Gives credit where credit is deserved.
Did you watch Ted Nelsons Google video?
Transclusion: Fixing Electronic Literature
John, great that there is at least one member here, that understands what I am talking about. You deserve the positive reppoint.
There we are competitors
It is not a lobbypoint.