COMMIT = '<commit/>'
UNHANDLE = '<unhandle/>'
SHIFT = '<shift>' SYMTERM '</shift>'
-SHIFTBACK = '<shift-back/>'
+SHIFTBACK = '<shiftback/>'
CHAR-AT = '<char-at>' MARKERTERM '</char-at>'
=> <integer>C</integer>, where C is the character in the preedit text
at the postion of MARKERTERM