FSM.mxml

<?xml version="1.0"?>
<fsm:FSMDeclaration
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:fsm="fsm.*"
    initial="{s1}">

    <fsm:State id="s1"/>
    <fsm:State id="s2"/>

</fsm:FSMDeclaration>

FSM_2.mxml

<?xml version="1.0"?>
<fsm:FSMDeclaration
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:fsm="fsm.*">
    <fsm:states>
       <fsm:State id="stateOne"/>
       <fsm:State id="stateTwo"/>
    </fsm:states>

</fsm:FSMDeclaration>

FSMDeclaration.as

package fsm {

[DefaultProperty("values")]

public class FSMDeclaration {

    public var initial:IState;

    public var values:Array = [];

}
}

Sequence.mxml

 <fx:Declarations>

    <s:Sequence>
        <s:children>
            <s:Move/>
        </s:children>
    </s:Sequence>

    <s:Sequence>
        <s:Move/>
    </s:Sequence>

</fx:Declarations>