{
     "type" : "sequence",
     "elements" : [
         {
             "type" : "filter",
             "plugin" : "uca"
         },
         {
             "type" : "filter",
             "plugin" : "scale",
             "properties" : {
                 "scale" : 0.5
             }
         },
         {
             "type" : "filter",
             "plugin" : "raw",
             "properties" : {
                 "prefix" : "foo"
             }
         }
     ]
}