I'm working on a Struts application.

In order to edit the `struts-config.xml` file, I think I have to add an attribute - `scope`, in the action tag. I'm not sure about its meaning, or its usage. 

```xml
<action path="/WetsVpnSwapTraffic"
            type="com.kpn.bop.web.action.vpn.wets.WetsVpnSwapTraffic"
            scope="request"
            name="WetsVpnSwapTrafficForm"
            roles="bop_wetsvpn_migrate"
            validate="false">
        <forward name="success" path="/WetsVpnSwapTrafficValidate.do"/>
        <forward name="failure" path="/WetsVpnList.do"/>
</action>  

```

Can anyone explain me if I have to put this attribute?