diff --git a/.github/workflows/check_examples.yml b/.github/workflows/check_examples.yml
new file mode 100644
index 00000000..647835bb
--- /dev/null
+++ b/.github/workflows/check_examples.yml
@@ -0,0 +1,42 @@
+name: Validate SCXML File
+
+on:
+    - push
+
+jobs:
+    find-files:
+        runs-on: ubuntu-latest
+        outputs:
+            files: ${{ steps.set-files.outputs.files }}
+        steps:
+            - uses: actions/checkout@v3
+            - name: Find SCXML files
+              id: set-files
+              run: |
+                  FILES=$(find examples/UC1-vacuum-cleaner/high-level-models -type f \( -name "*.ascxml" -o -name "*.scxml" -o -name "*.xml" \) | jq -R . | jq -s .)
+                  FILES=$(echo "$FILES" | tr -d '\n') # Ensure single-line JSON
+                  echo "Files found: $FILES"
+                  echo "files=$FILES" >> $GITHUB_OUTPUT
+    validate-xml:
+        strategy:
+            matrix:
+                path:
+                    - ${{ fromJson(needs.find-files.outputs.files) }}
+            fail-fast: false
+        needs: find-files
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v3
+            - name: Install xmllint
+              run: sudo apt-get install -y libxml2-utils
+            - name: Validate SCXML file
+              run: |
+                  SCHEMA_PATH=$(xmllint --xpath 'string(//@*[local-name()="noNamespaceSchemaLocation"])' "${{ matrix.path }}")
+                  if [ -z "$SCHEMA_PATH" ]; then
+                    echo "No schema found for file: ${{ matrix.path }}. Skipping validation."
+                    exit 0
+                  fi
+                  SCHEMA_DIR=$(dirname "${{ matrix.path }}")
+                  SCHEMA_PATH="$SCHEMA_DIR/$SCHEMA_PATH"
+                  echo "Using schema: $SCHEMA_PATH"
+                  xmllint --noout --schema "$SCHEMA_PATH" "${{ matrix.path }}";
diff --git a/data-format-specifications/RoAML/main.xsd b/data-format-specifications/RoAML-XML/main.xsd
similarity index 94%
rename from data-format-specifications/RoAML/main.xsd
rename to data-format-specifications/RoAML-XML/main.xsd
index 3a3fe487..5571cd6f 100644
--- a/data-format-specifications/RoAML/main.xsd
+++ b/data-format-specifications/RoAML-XML/main.xsd
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
-	<xs:element name="convince_mc_tc">
+	<xs:element name="roaml">
 		<xs:complexType>
 			<xs:sequence>
 				<xs:element name="mc_parameters">
@@ -72,4 +72,5 @@
 		</xs:complexType>
 	</xs:element>
 
-</xs:schema>
\ No newline at end of file
+
+</xs:schema>
diff --git a/data-format-specifications/RoAML-XML/todo.md b/data-format-specifications/RoAML-XML/todo.md
new file mode 100644
index 00000000..a5ce8064
--- /dev/null
+++ b/data-format-specifications/RoAML-XML/todo.md
@@ -0,0 +1,6 @@
+- [x] Change tag convince_mc_tc into roaml or something like it 
+- [ ] Check the issue of xmlns
+- [x] Change the extension of high level files from scxml to ascxml
+- [ ] Check xsd for BT: standard reference?
+- [ ] Only one xsd for components and skills? Also plugins?
+- [ ] What are the ROSprotocols in the examples?
diff --git a/data-format-specifications/RoAML/todo.txt b/data-format-specifications/RoAML/todo.txt
deleted file mode 100644
index c88af553..00000000
--- a/data-format-specifications/RoAML/todo.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-Change tag convince_mc_tc into roaml or something like it
-Check the issue of xmlns
-Change the extension of high level files from scxml to xml
-Check xsd for BT: standard reference?
-Only one xsd for components and skills? Also plugins?
-What are the ROSprotocols in the examples?
diff --git a/data-format-specifications/RoAML/bt_plugin.xsd b/data-format-specifications/bt-plugin-ASCXML/bt_plugin.xsd
similarity index 97%
rename from data-format-specifications/RoAML/bt_plugin.xsd
rename to data-format-specifications/bt-plugin-ASCXML/bt_plugin.xsd
index fd9d1724..f502a618 100644
--- a/data-format-specifications/RoAML/bt_plugin.xsd
+++ b/data-format-specifications/bt-plugin-ASCXML/bt_plugin.xsd
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
-	<xs:element name="scxml">
+	<xs:element name="ascxml">
 		<xs:complexType>
 			<xs:choice minOccurs="0" maxOccurs="unbounded">
 				<xs:element name="bt_declare_port_in">
diff --git a/data-format-specifications/main-XML/specifications.xsd b/data-format-specifications/main-XML/specifications.xsd
deleted file mode 100644
index 4e453839..00000000
--- a/data-format-specifications/main-XML/specifications.xsd
+++ /dev/null
@@ -1,136 +0,0 @@
-<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
-	<xsd:annotation>
-		<xsd:documentation xml:lang="en">
-			CONVINCE Specification XML format specification.
-		</xsd:documentation>
-	</xsd:annotation>
-
-	<xsd:element name="specification">
-		<xsd:complexType>
-			<xsd:sequence>
-
-				<xsd:element name="model">
-					<xsd:complexType>
-						<xsd:sequence>
-
-							<xsd:element name="skillList">
-								<xsd:complexType>
-									<xsd:sequence>
-										<xsd:element name="skillDeclaration" type="skillDeclarationType" minoccurs="0" maxoccurs="unbounded">
-									</xsd:sequence>
-									<xsd:attribute name="taskPlan" type="xsd:IDREF"/>
-								</xsd:compelexType>
-							</xsd:element>
-
-							<xsd:element name="componentList">
-								<xsd:complexType>
-									<xsd:sequence>
-										<xsd:element name="componentDeclaration" type="componentDeclarationType" minoccurs="0" maxoccurs="unbounded">
-									</xsd:sequence>
-								</xsd:compelexType>
-							</xsd:element>
-
-							<xsd:element name="types">
-								<xsd:attribute name="path" type="xsd:URI">
-							</xsd:element>
-
-							<xsd:element name="interfaceList">
-								<xsd:complexType>
-									<xsd:sequence>
-										<xsd:element name="interface" type="interfaceType" minoccurs="0" maxoccurs="unbounded">
-									</xsd:sequence>
-								</xsd:compelexType>
-							</xsd:element>
-	
-						<xsd:sequence>
-					</xsd:complexType>
-				</xsd:element>
-
-				<xsd:element name="properties">
-					<xsd:attribute name="path" type="xsd:URI">
-				</xsd:element>
-			<xsd:sequence>
-		</xsd:complexType>
-	</xsd:element>
-
-	<xsd:complexType name="skillDeclarationType">
-		<xsd:sequence>
-			<xsd:element name="skillDefinition">
-				<xsd:complexContent>
-					<xsd:attribute name="type" type="skillType"/>
-					<xsd:attribute name="moc" type="mocType"/>
-					<xsd:attribute name="path" type="anyURI"/>
-				</xsd:complexContent>
-			</xsd:element>
-		</xsd:sequence>
-		<xsd:attribute name="id" type="xsd:ID"/>
-		<xsd:attribute name="interface" type="xsd:IDREF"/>
-	</xsd:complexType>
-
-	<xsd:complexType name="componentDeclarationType">
-		<xsd:sequence>
-			<xsd:element name="componentDefinition">
-				<xsd:complexContent>
-					<xsd:attribute name="moc" type="mocType"/>
-					<xsd:attribute name="path" type="anyURI"/>
-				</xsd:complexContent>
-			</xsd:element>
-		<xsd:sequence>
-		<xsd:attribute name="id" type="xsd:ID"/>
-		<xsd:attribute name="interface" type="xsd:IDREF"/>
-	</xsd:complexType>
-
-	<xsd:simpleType name="skillType">
-		<xsd:restriction>
-			<xsd:enumeration value="condition"/>
-			<xsd:enumeration value="action"/>
-		</xsd:restriction>
-	</xsd:simpleType>
-
-	<xsd:simpleType name="moqType">
-		<xsd:restriction>
-			<xsd:enumeration value="fsm"/>
-			<xsd:enumeration value="bt"/>
-		</xsd:restriction>
-	</xsd:simpleType>
-
-	<xsd:complexType name="interface">
-		<xsd:sequence>
-			<xsd:element name="function" minoccurs="0" maxoccurs="unbounded">
-				<xsd:complexType>
-					<xsd:sequence>
-						<xsd:element name="componentProtocol">
-							<xsd:complexContent>
-								<xsd:choice>
-									<xsd:element name="ROS2data" type="ROS2dataType"/>
-								</xsd:choice>
-							</xsd:complexContent>
-						</xsd:element>
-						<!-- dataType as defined in SCOPE XML sec. 9.2 -->
-						<xsd:element name="returnValue" type="dataType" />
-						<xsd:element name="callParam" type="dataType" />
-					</xsd:sequence>
-					<xsd:attribute name="id" type="xsd:ID"/>
-				</xsd:complexType>
-			</xsd:element>
-		</xsd:sequence>
-		<xsd:attribute name="id" type="xsd:ID"/>
-	</xsd:complexType>
-
-	<xsd:complexType name="ROS2dataType">
-		<xsd:element name="interface">
-		  <xsd:complexType>
-		    <xsd:attribute name="type" type="ROS2interfaces"/>
-		  </xsd:complexType>
-		</xsd:element>
-	</xsd:complexType>
-
-	<xsd:simpleType name="ROS2interfaces">
-		<xsd:restriction>
-			<xsd:enumeration value="sync-service"/>
-			<xsd:enumeration value="sync-service"/>
-			<xsd:enumeration value="topic"/>
-			<xsd:enumeration value="action"/>
-		</xsd:restriction>
-	</xsd:simpleType>
-</xsd:schema>
diff --git a/data-format-specifications/RoAML/properties.xsd b/data-format-specifications/property-specification-XML/properties.xsd
similarity index 100%
rename from data-format-specifications/RoAML/properties.xsd
rename to data-format-specifications/property-specification-XML/properties.xsd
diff --git a/data-format-specifications/property-specification-XML/property.xsd b/data-format-specifications/property-specification-XML/property.xsd
deleted file mode 100644
index fc4cd514..00000000
--- a/data-format-specifications/property-specification-XML/property.xsd
+++ /dev/null
@@ -1,73 +0,0 @@
-<?xml version="1.1" encoding="UTF-8" ?>
-
-<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
-	<xsd:annotation>
-		<xsd:documentation xml:lang="en">
-			CONVINCE Property Specification Language XML format specification.
-		</xsd:documentation>
-	</xsd:annotation>
-
-	<xsd:element name="properties" type="propertiesType"/>
-	
-	<xsd:complexType name="propertiesType">
-		<xsd:all>
-			<xsd:element name="ports" type="portsType"/>
-			<xsd:element name="guarantees" type="propertyListType" minOccurs="0"/>
-			<xsd:element name="assumes" type="propertyListType" minOccurs="0"/>
-		</xsd:all>
-	</xsd:complexType>
-
-	<xsd:complexType name="portsType">
-		<xsd:sequence>
-			<xsd:element name="scxml_event_send" type="eventSendType" minOccurs="0" maxOccurs="unbounded" />
-		</xsd:sequence>
-	</xsd:complexType>
-
-	<xsd:complexType name="eventSendType">
-		<xsd:sequence>
-			<xsd:choice minOccurs="0" maxOccurs="unbounded">
-				<xsd:element name="state_var" type="stateVarType" />
-				<xsd:element name="event_var" type="eventVarType" />
-			</xsd:choice>
-		</xsd:sequence>
-		<xsd:attribute name="event" type="xsd:IDREF" />
-		<xsd:attribute name="origin" type="xsd:IDREF" />
-		<xsd:attribute name="target" type="xsd:IDREF" />
-	</xsd:complexType>
-
-	<xsd:complexType name="varType">
-		<xsd:choice>
-			<xsd:element name="state_var" type="stateVarType" />
-			<xsd:element name="event_var" type="eventVarType" />
-		</xsd:choice>
-	</xsd:complexType>
-
-	<xsd:complexType name="stateVarType">
-		<xsd:attribute name="id" type="xsd:ID" />
-		<xsd:attribute name="param" type="xsd:IDREF" />
-		<xsd:attribute name="type" type="xsd:IDREF" />
-		<xsd:attribute name="expr" type="xsd:string" />
-	</xsd:complexType>
-
-	<xsd:complexType name="eventVarType">
-		<xsd:attribute name="id" type="xsd:ID" />
-	</xsd:complexType>
-
-	<xsd:complexType name="propertyListType">
-		<xsd:sequence>
-			<xsd:element name="property" type="propertyType" minOccurs="0" maxOccurs="unbounded" />
-		</xsd:sequence>
-	</xsd:complexType>
-
-	<xsd:complexType name="propertyType">
-		<xsd:attribute name="id" type="xsd:ID" />
-		<xsd:attribute name="logic" type="logicType" />
-		<xsd:attribute name="expr" type="xsd:string" />
-	</xsd:complexType>
-
-	<xsd:simpleType name="logicType">
-		<xsd:restriction base="xsd:string">
-			<xsd:enumeration value="pmtl"/>
-		</xsd:restriction>
-	</xsd:simpleType>
-</xsd:schema>
diff --git a/data-format-specifications/RoAML/component.xsd b/data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd
similarity index 97%
rename from data-format-specifications/RoAML/component.xsd
rename to data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd
index fd9d1724..f502a618 100644
--- a/data-format-specifications/RoAML/component.xsd
+++ b/data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
-	<xs:element name="scxml">
+	<xs:element name="ascxml">
 		<xs:complexType>
 			<xs:choice minOccurs="0" maxOccurs="unbounded">
 				<xs:element name="bt_declare_port_in">
diff --git a/data-format-specifications/RoAML/skill.xsd b/data-format-specifications/skill-components-(A)SCXML/ascxml_skill.xsd
similarity index 97%
rename from data-format-specifications/RoAML/skill.xsd
rename to data-format-specifications/skill-components-(A)SCXML/ascxml_skill.xsd
index fd9d1724..f502a618 100644
--- a/data-format-specifications/RoAML/skill.xsd
+++ b/data-format-specifications/skill-components-(A)SCXML/ascxml_skill.xsd
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
-	<xs:element name="scxml">
+	<xs:element name="ascxml">
 		<xs:complexType>
 			<xs:choice minOccurs="0" maxOccurs="unbounded">
 				<xs:element name="bt_declare_port_in">
diff --git a/data-format-specifications/skill-functions-SCXML/README.md b/data-format-specifications/skill-components-(A)SCXML/scxml_limitations.md
similarity index 100%
rename from data-format-specifications/skill-functions-SCXML/README.md
rename to data-format-specifications/skill-components-(A)SCXML/scxml_limitations.md
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_back_up.scxml b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_back_up.scxml
index b34b964c..e7614f93 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_back_up.scxml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_back_up.scxml
@@ -3,7 +3,8 @@
     initial="initial"
     name="BackUp"
     model_src=""
-    xmlns="http://www.w3.org/2005/07/scxml">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd">
 
     <ros_topic_publisher name="cmd" topic="/cmd_vel" type="std_msgs/Int16" />
 
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_is_bump_detected.scxml b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_is_bump_detected.scxml
index 495b2495..65904fd1 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_is_bump_detected.scxml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_is_bump_detected.scxml
@@ -3,7 +3,8 @@
     initial="initial"
     name="IsBumpDetected"
     model_src=""
-    xmlns="http://www.w3.org/2005/07/scxml">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd">
 
     <datamodel>
         <data id="state" expr="false" type="bool" />
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_is_charging.scxml b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_is_charging.scxml
index b5885d0d..eff111a1 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_is_charging.scxml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_is_charging.scxml
@@ -3,7 +3,8 @@
     initial="initial"
     name="IsCharging"
     model_src=""
-    xmlns="http://www.w3.org/2005/07/scxml">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd">
 
     <datamodel>
         <data id="msg_received" expr="false" type="bool" />
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_perform_docking_maneuver.scxml b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_perform_docking_maneuver.scxml
index 9855312e..5a5efe99 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_perform_docking_maneuver.scxml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_perform_docking_maneuver.scxml
@@ -3,7 +3,8 @@
     initial="initial"
     name="PerformDockingManeuver"
     model_src=""
-    xmlns="http://www.w3.org/2005/07/scxml">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd">
 
     <ros_topic_publisher name="cmd" topic="/cmd_vel" type="std_msgs/Int16" />
     <ros_topic_subscriber name="dock_dist" topic="/dist_to_dock" type="std_msgs/Int16" />
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_perform_docking_maneuver_bug.scxml b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_perform_docking_maneuver_bug.scxml
index cf4515dd..96dae03d 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_perform_docking_maneuver_bug.scxml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_perform_docking_maneuver_bug.scxml
@@ -3,7 +3,8 @@
     initial="initial"
     name="PerformDockingManeuver"
     model_src=""
-    xmlns="http://www.w3.org/2005/07/scxml">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd">
 
     <ros_topic_publisher name="cmd" topic="/cmd_vel" type="std_msgs/Int16" />
 
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_reset_bumper_state.scxml b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_reset_bumper_state.scxml
index 07e26636..2f498d0f 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_reset_bumper_state.scxml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_reset_bumper_state.scxml
@@ -3,7 +3,8 @@
     initial="initial"
     name="ResetBumperState"
     model_src=""
-    xmlns="http://www.w3.org/2005/07/scxml">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd">
 
     <ros_service_client name="reset_bump" service_name="/reset_bump" type="std_srvs/Empty" />
 
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_simple_wait.scxml b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_simple_wait.scxml
index 80cc6f35..e36a8de8 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_simple_wait.scxml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/bt_plugins/bt_simple_wait.scxml
@@ -3,7 +3,8 @@
     initial="initial"
     name="SimpleWait"
     model_src=""
-    xmlns="http://www.w3.org/2005/07/scxml">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd">
 
     <datamodel>
         <data id="waiting" expr="false" type="bool" />
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/main.xml b/examples/UC1-vacuum-cleaner/high-level-models/main.xml
index f0973075..b5965ba5 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/main.xml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/main.xml
@@ -1,9 +1,13 @@
-<roaml>
-    <parameters>
+<?xml version="1.0" encoding="UTF-8"?>
+<roaml
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../data-format-specifications/RoAML-XML/main.xsd">
+
+    <mc_parameters>
         <max_time value="40" unit="s" />
         <bt_tick_rate value="5.0" />
         <bt_tick_if_not_running value="true" />
-    </parameters>
+    </mc_parameters>
 
     <behavior_tree>
         <input type="bt.cpp-xml" src="./bt_policies/policy.xml" />
diff --git a/examples/UC1-vacuum-cleaner/high-level-models/nodes/robot_model.scxml b/examples/UC1-vacuum-cleaner/high-level-models/nodes/robot_model.scxml
index b1048f71..65af9fab 100644
--- a/examples/UC1-vacuum-cleaner/high-level-models/nodes/robot_model.scxml
+++ b/examples/UC1-vacuum-cleaner/high-level-models/nodes/robot_model.scxml
@@ -3,7 +3,8 @@
     initial="running"
     name="RobotModel"
     model_src=""
-    xmlns="http://www.w3.org/2005/07/scxml">
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="../../../../data-format-specifications/skill-components-(A)SCXML/ascxml_component.xsd">
 
     <datamodel>
         <!-- Counter for timer callbacks, for "random" bump event -->