The quoting syntax used for images is intended to be extensible in the obvious way to any other use. I think the node quoting should use it too. The control character sequence it uses (^@^H) was chosen to minimize the chance of affecting any terminal output in browsers that don't recognize it. No one has reported any problems with it to my knowledge. Worrying about real info files containing ^@^H is not necessary.
Sorry, can't write a full reply right now. k
