= R"(
<root main_tree_to_execute = "MainTree">
<!--------------------------------------->
<BehaviorTree ID="DoorClosed">
<Sequence name="door_closed_sequence">
<Inverter>
<Condition ID="IsDoorOpen"/>
</Inverter>
<RetryUntilSuccesful num_attempts="4">
<OpenDoor/>
</RetryUntilSuccesful>
<PassThroughDoor/>
</Sequence>
</BehaviorTree>
<!--------------------------------------->
<BehaviorTree ID="MainTree">
<Fallback name="root_Fallback">
<Sequence name="door_open_sequence">
<IsDoorOpen/>
<PassThroughDoor/>
</Sequence>
<SubTree ID="DoorClosed"/>
<PassThroughWindow/>
</Fallback>
</BehaviorTree>
<!--------------------------------------->
</root>
)"