<Aggregation> :: (<Personas> | <Devices>)
                         <Platforms>

           <Personas> :: <Persona> <Personas> | ∅

            <Persona> :: <Browsing History>
                         <Disclosure History>

   <Browsing History> :: <Platforms> <Devices>

          <Platforms> :: <Platform> <Platforms> | ∅

           <Platform> :: <Target Demographics>
                         <Content Categories>
                         <Entities> <Devices>

            <Devices> :: <Device> <Devices> | ∅

             <Device> :: <Hardware> <Software>

           <Entities> :: <Entity> <Entities>

             <Entity> :: <Tracker> | <Advertiser> |
                         <Platform> | ∅

            <Tracker> :: <Target Demographics>
                         <Content Categories>

         <Advertiser> :: <Target Demographics>
                         <Content Categories>

<Target Demographics> :: <Demographic> <Demographics>

       <Demographics> :: <Demographic> <Demographics> | ∅