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diff --git a/doc/nyan/scripting_nyan_tree.uxf b/doc/nyan/scripting_nyan_tree.uxf
new file mode 100644
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+++ b/doc/nyan/scripting_nyan_tree.uxf
@@ -0,0 +1,465 @@
+<?xml version="1.0" encoding="UTF-8"?><diagram program="umlet" version="13.3">
+  <zoom_level>10</zoom_level>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>750</x>
+      <y>260</y>
+      <w>100</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*Entity*
+bg=red</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>230</x>
+      <y>250</y>
+      <w>180</w>
+      <h>80</h>
+    </coordinates>
+    <panel_attributes>*TargetedScript*
+bg=pink
+
+--
+events : set(Event)</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>730</x>
+      <y>440</y>
+      <w>140</w>
+      <h>80</h>
+    </coordinates>
+    <panel_attributes>*Event*
+bg=pink
+
+--
+function : text
+mode : Mode</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>790</x>
+      <y>310</y>
+      <w>30</w>
+      <h>150</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;-</panel_attributes>
+    <additional_attributes>10.0;10.0;10.0;130.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>400</x>
+      <y>280</y>
+      <w>170</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;-</panel_attributes>
+    <additional_attributes>150.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>650</x>
+      <y>280</y>
+      <w>120</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;-</panel_attributes>
+    <additional_attributes>100.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>550</x>
+      <y>260</y>
+      <w>110</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*Script*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>410</x>
+      <y>610</y>
+      <w>120</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*OnCreate*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>410</x>
+      <y>680</y>
+      <w>120</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*OnPatch*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>410</x>
+      <y>750</y>
+      <w>120</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*OnDestroy*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>630</x>
+      <y>610</y>
+      <w>120</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*OnStart*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>630</x>
+      <y>770</y>
+      <w>120</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*OnFinish*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>630</x>
+      <y>680</y>
+      <w>160</w>
+      <h>80</h>
+    </coordinates>
+    <panel_attributes>*OnInterval*
+bg=pink
+
+--
+// Interval in seconds
+interval : int</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>810</x>
+      <y>610</y>
+      <w>120</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*OnEmpty*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>810</x>
+      <y>680</y>
+      <w>120</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*OnDepleted*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>1030</x>
+      <y>610</y>
+      <w>180</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*OnConditionFulfilled*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>960</x>
+      <y>260</y>
+      <w>110</w>
+      <h>60</h>
+    </coordinates>
+    <panel_attributes>
+*Mode*
+bg=pink</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>840</x>
+      <y>280</y>
+      <w>140</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;-</panel_attributes>
+    <additional_attributes>10.0;10.0;120.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>310</x>
+      <y>320</y>
+      <w>440</w>
+      <h>180</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;.</panel_attributes>
+    <additional_attributes>420.0;160.0;10.0;160.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>790</x>
+      <y>510</y>
+      <w>30</w>
+      <h>70</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;-</panel_attributes>
+    <additional_attributes>10.0;10.0;10.0;50.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>570</x>
+      <y>550</y>
+      <w>250</w>
+      <h>270</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>230.0;10.0;10.0;10.0;10.0;250.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>790</x>
+      <y>550</y>
+      <w>210</w>
+      <h>180</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>190.0;160.0;190.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>920</x>
+      <y>630</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>970</x>
+      <y>630</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>920</x>
+      <y>700</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>520</x>
+      <y>630</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>520</x>
+      <y>700</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>520</x>
+      <y>770</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>570</x>
+      <y>790</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>570</x>
+      <y>710</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>570</x>
+      <y>630</y>
+      <w>80</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>lt=-</panel_attributes>
+    <additional_attributes>60.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLClass</id>
+    <coordinates>
+      <x>530</x>
+      <y>120</y>
+      <w>150</w>
+      <h>80</h>
+    </coordinates>
+    <panel_attributes>*Scriptable*
+bg=pink
+
+--
+scripts : set(Script)</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>600</x>
+      <y>190</y>
+      <w>30</w>
+      <h>90</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;.</panel_attributes>
+    <additional_attributes>10.0;70.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>Relation</id>
+    <coordinates>
+      <x>670</x>
+      <y>150</y>
+      <w>150</w>
+      <h>130</h>
+    </coordinates>
+    <panel_attributes>lt=&lt;&lt;-</panel_attributes>
+    <additional_attributes>130.0;110.0;130.0;10.0;10.0;10.0</additional_attributes>
+  </element>
+  <element>
+    <id>UMLNote</id>
+    <coordinates>
+      <x>410</x>
+      <y>820</y>
+      <w>90</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>Entity
+bg=blue</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLNote</id>
+    <coordinates>
+      <x>630</x>
+      <y>840</y>
+      <w>90</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>Ability
+bg=blue</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLNote</id>
+    <coordinates>
+      <x>810</x>
+      <y>750</y>
+      <w>120</w>
+      <h>30</h>
+    </coordinates>
+    <panel_attributes>ResourceSpot
+bg=blue</panel_attributes>
+    <additional_attributes/>
+  </element>
+  <element>
+    <id>UMLNote</id>
+    <coordinates>
+      <x>1030</x>
+      <y>680</y>
+      <w>180</w>
+      <h>50</h>
+    </coordinates>
+    <panel_attributes>Prerequisite/AvailabityRequirement
+bg=blue</panel_attributes>
+    <additional_attributes/>
+  </element>
+</diagram>