[SCXML] Support for Commons JEXL in SCXML

[Diptendu Dutta]

Some thing like

<datamodel>
                <data id="intent" expr="null"/>
                <data id="startState" expr="&quot;Start&quot;"/>
</datamodel>
..
     <state id="StartBot">
..
      <transition target='${startState}' />
     </state>

does not work.

*SEVERE: Transition target with ID "${startState}" not found*

However, the spec at
https://commons.apache.org/proper/commons-jexl/reference/syntax.html
mentions

If a variable user valued JEXL is present in the environment - whether as a
local or global variable -, the format

`Hello ${user}`

will evaluate as

Hello JEXL

How can I make this work?

Regards,

Diptendu Dutta