Updated Note: For 6.2B, you do not need
to show all of the values for all of the features in the tree (as indicated
in the book). Instead, your tree should show:
All values of all semantic (SEM) features.
The value of any VAL features which are not empty lists. The
elements of these lists can be indicated as abbreviations (e.g., NP).
Use tags to show where the elements of VAL lists are identified with
other values/nodes in the tree.
Make sure that indices which should be identified are shown
with the same letter.
You do not need to show the effect of the HFP or the semantic principles
using tags, though you may use tags if you wish to show the SEM values
of phrasal nodes more compactly.