The Cancel Action Execution action (highlighted in the screenshot below) cancels the execution of the event's action sequence. In the screenshot below, for example, if an exception is thrown in Try part of the Try/Catch action, then the Catch part of the Try/Catch action is executed. Since this part contains the Cancel Action Execution action, the event's sequence of actions is canceled. As a result, the Share action will not be executed.
MobileTogether provides a range of XPath extension functions that have been specifically created for use in MobileTogether designs. Some functions can be particularly useful with specific actions. For example, mt-available-languages() returns the languages in which the solution is available and could, for example, be used with the Message Box action. If a function is especially relevant to this action, it is listed below. For a full list of extension functions and their descriptions, see the topic MobileTogether Extension Functions.