I don't know what that option should do in xtream editor, but it is probably something for their Enigma2 plugin or so...
EPG provides rating information in most cases. In many cases it doesn't.
Some software have options to recognize those ratings and hide the data if needed.
As a normal user you can use the parental control of your media center for the channel, like in KODI: http://kodi.wiki/view/Settings/TV/Parental_control
If you hide a channel behind a code, the EPG data will be hidden as well.
Everything else doesn't make sense at all.
I also can't find any information on the net, how it should work.
XMLTV format has no parental contor tags. At least I don't know and I can't find anything about it.
EPG provides rating information in most cases. In many cases it doesn't.
Some software have options to recognize those ratings and hide the data if needed.
As a normal user you can use the parental control of your media center for the channel, like in KODI: http://kodi.wiki/view/Settings/TV/Parental_control
If you hide a channel behind a code, the EPG data will be hidden as well.
Everything else doesn't make sense at all.
I also can't find any information on the net, how it should work.
XMLTV format has no parental contor tags. At least I don't know and I can't find anything about it.