+POP = '<pop/>'
+UNDO = '<undo>' INTTERM ? '</undo>'
+COMMIT = '<commit/>'
+UNHANDLE = '<unhandle/>'
+SHIFT = '<shift>' SYMTERM '</shift>'
+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
+KEY-COUNT = '<key-count/>'
+ => <integer>N</integer>, where N is the number of currently handled keys
+SURROUNDING-TEXT-FLAG = '<surrounding-text-flag/>'
+ => <integer>1</integer> or <integer>0</integer>