collections {
   group {
      name: "example_group";
      max: 500 500;
      min: 50 50;

      parts {
         part {
            name: "part_one";
            type: SWALLOW;
            description {
               min: 50 50;
               state: "default" 0.0;
               rel1.relative: 0.0 0.0;
               rel2.relative: 1.0 1.0;
            }
         }
      }

   }
}