           {
             commands: [
               ['<=',
-                ['get',['$reserved','this'],'x']
-                ['get',['$reserved','this'],'y']
+                ['get',['&'],'x']
+                ['get',['&'],'y']
               ]
               ['set','y','100px']
               ['>=',
-                ['get',['$reserved','this'],'z']
-                ['get',['$reserved','this'],'y']
+                ['get',['&'],'z']
+                ['get',['&'],'y']
               ]
             ]
           }

        ,
          {
            commands: [
              ['==', ['get','bottom'], ['get',['$reserved','window'],'height']]
            ]
          }


        ,
          {
            commands: [
              ['==', ['get',['::scope'],'width'],    ['get',['&'],'width' ]]
              ['==', ['get',['&'],'width'],          ['get',['::document'],'width' ]]
              ['==', ['get',['::document'],'width'], ['get',['::window'],'width' ]]
              ['==', ['get',['::window'],'width'],   ['get',['::window'],'height']]
            ]
          }

