<?xml version="1.0" ?>
<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0">
    <state id="wrapper" initial="on">
        <state id="on">
            <state id="negated2">
    <state id="operand2">
            </state>
        </state>
        <transition event="OP.INSERT">
            <if cond="_event.data.operator == 'OPER.PLUS'">
                <assign location="long_expr" expr="long_expr+'+'" />
            <elsDif cond="_event.data.operator=='OPER.MINUS'" />
                <assign location="long_expr" expr="long_expr+'-'" />
            </if>
        </transition>
    </state>
</scxml>
