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Start events define where a Process or Sub Process starts. The process engine supports different types of start events: The engine requires at least one start event to instantiate a process. There can be a maximum of one blank or timer start event per process definition. There can be multiple message or signal start events.

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Asynchronous Instantiation

A start event may be declared as asynchronous with camunda:asyncBefore="true" 
<startEvent id="startEvent" camunda:asyncBefore="true" />
This will ensure that the process engine creates a process instance when the process is instantiated, but the execution of the initial activities is not done synchronously. Instead, a job is created and asynchronously processed by the job executor. See the Asynchronous Continuations section of the User Guide for some background information.

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ASEE Flow Extensions

Attributes camunda:asyncBefore, camunda:asyncAfter, camunda:exclusive, camunda:formHandlerClass, camunda:formKey, camunda:formRef, camunda:formRefBinding, camunda:formRefVersion, camunda:initiator, camunda:jobPriority
Extension Elements camunda:failedJobRetryTimeCycle, camunda:formData, camunda:formProperty,
Constraints The camunda:exclusive attribute is only evaluated if the attribute camunda:asyncBefore or camunda:asyncAfter is set to true
The attributes camunda:asyncBefore and camunda:initiator are only available for start events of a Process
Only one camunda:formData extension element is allowed
The attributes camunda:formHandlerClass and camunda:formKey are only available for the intital start event of a Process