11. A method for a user interface recognizing the interruption of the execution of a first gesture with the execution of a second gesture, the method comprising: receiving measured information from a user interface sensor, the measured information responsive to user interaction actions made by a user; applying at least one operation to the measured information to produce a sequence of symbols, each symbol produced by the at least one operation responsive to an associated portion of a user interaction actions made by the user; determining from the sequence of symbols that the user's execution of a first gesture has been interrupted; determining from the sequence of symbols that the user's execution of a second gesture has been started and completed before the first gesture has been resumed; and determining from the sequence of symbols that the user's execution of the first gesture has been completed; wherein the first gesture is recognized and the second gesture is recognized.
11. A method for a user interface recognizing the interruption of the execution of a first gesture with the execution of a second gesture, the method comprising: receiving measured information from a user interface sensor, the measured information responsive to user interaction actions made by a user; applying at least one operation to the measured information to produce a sequence of symbols, each symbol produced by the at least one operation responsive to an associated portion of a user interaction actions made by the user; determining from the sequence of symbols that the user's execution of a first gesture has been interrupted; determining from the sequence of symbols that the user's execution of a second gesture has been started and completed before the first gesture has been resumed; and determining from the sequence of symbols that the user's execution of the first gesture has been completed; wherein the first gesture is recognized and the second gesture is recognized. 12. The method of claim 11 wherein the recognized interruption of the trajectory of the first gesture is used to convey semantic content.