Revision control
++ <?xml version="1.0" encoding="UTF-8"?><!-- we test that <param> uses the current value of var1, not its initial value. If the value of
++ aParam in event1 is 2 so that var2 gets set to 2, success, otherwise failure --><scxml xmlns="http://www.w3.org/2005/07/scxml" xmlns:conf="http://www.w3.org/2005/scxml-conformance" initial="s0" version="1.0" datamodel="ecmascript">
++ <datamodel>
++ <data id="Var1" expr="1"/>
++ <data id="Var2"/>
++ </datamodel>
++
++ <state id="s0">
++ <onentry>
++ <assign location="Var1" expr="2"/>
++ <send event="event1">
++ <param name="aParam" expr="Var1"/>
++ </send>
++ </onentry>
++
++ <transition event="event1" target="s1">
++ <assign location="Var2" expr="_event.data.aParam"/>
++ </transition>
++ <transition event="*" target="fail"/>
++ </state>
++
++ <state id="s1">
++ <transition cond="Var2==2" target="pass"/>
++ <transition target="fail"/>
++ </state>
++
++ <final id="pass"><onentry><log label="Outcome" expr="'pass'"/></onentry></final>
++ <final id="fail"><onentry><log label="Outcome" expr="'fail'"/></onentry></final>
++
++ </scxml>