The 'Sandbox' is a small view used to edit the data associated with a single Wordform... specifically, the data associated with a standard interlinear view. It uses a different, simpler model than the real interlinear view, documented below under the constants we use to describe it. This view makes editing easier. A further advantage is that we don't have to worry, until the view closes, about whether the user is editing one of the existing analyses or creating a new one.