Add new notation

Hi,

Like bpmn:Task, bpmn:ServiceTask, bpmn:UserTask. I want to add a new type bpmn:TestingTask.

Can you please provide me any information on how to achieve this.

Thanks

bpmn:TestingTask will not be valid BPMN. Check out this example to learn more about custom(izing) elements: https://github.com/bpmn-io/bpmn-js-examples/tree/master/custom-elements