2.5.4.3 MultipleInstancesPolicy

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If present, the MultipleInstancesPolicy field contains one of the following values: Parallel, Queue, IgnoreNew, or StopExisting.

 <!-- MultipleInstancesPolicy -->
 <xs:simpleType name="multipleInstancesPolicyType">
   <xs:restriction base="xs:string">
       <xs:enumeration value="Parallel"/>
       <xs:enumeration value="Queue"/>
       <xs:enumeration value="IgnoreNew"/>
       <xs:enumeration value="StopExisting"/>
   </xs:restriction>
 </xs:simpleType>

Parallel: Specifies that multiple instances of the task can start in parallel for each occurring trigger.

Queue: Specifies that execution instances related to this trigger can start serially, on the completion of the previous instance.

IgnoreNew: Specifies that all additional triggers can be ignored during the execution of an instance.

StopExisting: Specifies that the running instance can be stopped and a new instance can be started on any additional trigger occurrence.