In order for spatial Braille to work and screen reader "review mode", we need bounding rectangle information for all text on the screen, and also the ability to get text substrings.

If it proves difficult to implement all of the methods in the AccessibleText interface (e.g. the getCharacterAttribute method), another option might be to only implement AccessibleExtendedText and then duplicate some of the methods of AccessibleText in AccessibleExtendedText.