diff -r 8f3cb4b47cbb -r 3c893aed9198 svghmi/svghmi.py
--- a/svghmi/svghmi.py	Fri Jul 23 13:15:19 2021 +0200
+++ b/svghmi/svghmi.py	Fri Jul 23 13:16:15 2021 +0200
@@ -297,6 +297,7 @@
         <xsd:complexType>
           <xsd:attribute name="OnStart" type="xsd:string" use="optional" default="chromium {url}"/>
           <xsd:attribute name="OnStop" type="xsd:string" use="optional" default="echo 'please close chromium window at {url}'"/>
+          <xsd:attribute name="OnWatchdog" type="xsd:string" use="optional" default="echo 'Watchdog for {name} !'"/>
           <xsd:attribute name="EnableWatchdog" type="xsd:boolean" use="optional" default="false"/>
           <xsd:attribute name="WatchdogInitial" use="optional" default="30">
             <xsd:simpleType>