Fortunately, the system being defined here has very little need for forms. But tables are another matter. Tables are highly useful formats for displaying information that are rather tricky to implement. Having created that view, however, it would nice to save either a static or dynamic copy of it. Including that specification in a document would then signal the display to create the table.
Dynamic copies are probably the easiest to develop, and they are still darn hard.
But saving static copies is harder. This requirement comes from an analysis of the NLS video. Back links let a node identify every other node that points to it. So, if I add put a comment in the system that links to a node in your document, you have the ability to retreive all of the comments made on your document, and display them in context as you edit. Although we don't know what to do with character addressing, exactly, he suggested that not having that ability would impose an arbitrary limitation.