Clean up Python example XMLs.

Author: kylc

python_examples/ex03_stateful_nodes.py

@@ -18,14 +18,12 @@
  <root BTCPP_format="4" >
 
      <BehaviorTree ID="MainTree">
-        <Sequence>
-            <!-- Interpolate from the initial position to the final one printing
-                 at each step. -->
-            <ReactiveSequence name="root">
-                <Print value="{interpolated}" />
-                <Interpolate x0="[1.0, 0.0]" x1="[0.0, 1.0]" out="{interpolated}" />
-            </ReactiveSequence>
-        </Sequence>
+         <!-- Interpolate from the initial position to the final one printing at
+              each step. -->
+         <ReactiveSequence name="root">
+             <Print value="{interpolated}" />
+             <Interpolate x0="[1.0, 0.0]" x1="[0.0, 1.0]" out="{interpolated}" />
+         </ReactiveSequence>
      </BehaviorTree>
 
  </root>

python_examples/ex04_ros_interop.py

@@ -28,12 +28,10 @@
  <root BTCPP_format="4" >
 
      <BehaviorTree ID="MainTree">
-        <Sequence>
-            <ReactiveSequence name="root">
-                <Print value="{tf}" />
-                <GetRosTransform frame_id="odom" child_frame_id="base_link" tf="{tf}" />
-            </ReactiveSequence>
-        </Sequence>
+        <ReactiveSequence name="root">
+            <Print value="{tf}" />
+            <GetRosTransform frame_id="odom" child_frame_id="base_link" tf="{tf}" />
+        </ReactiveSequence>
      </BehaviorTree>
 
  </root>

python_examples/ex05_type_interop.py

@@ -11,19 +11,19 @@
  <root BTCPP_format="4" >
 
      <BehaviorTree ID="MainTree">
-        <Sequence name="root">
-            <!-- (C++ node) Put a C++ object on the blackboard -->
-            <RandomVector vector="{simple}" />
-            <!-- (Py node) Print it from Python -->
-            <Print        value="{simple}" />
-
-            <!-- (Py node) Put a Python type onto the blackboard -->
-            <PutVector    output="{complex}" />
-            <!-- (C++ node) Print it from C++ using native C++ types -->
-            <PrintComplex input="{complex}" />
-            <!-- (Py node) Print it from Python -->
-            <Print        value="{complex}" />
-        </Sequence>
+         <Sequence name="root">
+             <!-- (C++ node) Put a C++ object on the blackboard -->
+             <RandomVector vector="{simple}" />
+             <!-- (Py node) Print it from Python -->
+             <Print        value="{simple}" />
+
+             <!-- (Py node) Put a Python type onto the blackboard -->
+             <PutVector    output="{complex}" />
+             <!-- (C++ node) Print it from C++ using native C++ types -->
+             <PrintComplex input="{complex}" />
+             <!-- (Py node) Print it from Python -->
+             <Print        value="{complex}" />
+         </Sequence>
      </BehaviorTree>
 
  </root>