It seems to be more useful to show the semantic representation in the bottom half of the tree window rather than as a pop-up, since users might want to be able to compare the two. The tree pane could perhaps be split into two scrollable panes and have the tree on the top and the semantic representation on the bottom.
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This really needs to be discussed. It is true that when you have a small tree it looks like a good idea. However if you have a big tree you won't be able to look at it. I will put this bug down in priority as it needs more discussion.
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Ok. I think we discussed this when you were in Geneva, but I can't remember what the outcome was.