function SimpleChain1(conf,inputs,outputs){

  // Create all required ZOO.formats
  var fGJ=new ZOO.Format.GeoJSON();
  var fGML=new ZOO.Format.GML();

  // Read the input GML
  var inputData=fGML.read(inputs["InputData"]["value"]);

  // Compute big Buffer
  var bufferResultAsJSON=Buffer(inputData,0.015);

  // Create the Buffer result BBOX
  var bbox = new ZOO.Bounds();
  var bounds=bufferResultAsJSON[0].geometry.getVertices();
  for(var t in bounds){
    bbox.extend(bounds[t]);
  }
  var finalG=bbox.toGeometry();

  // Compute Buffer standard buffer
  var bufferResultAsJSON=Buffer(inputData,0.0015);

  // Request Difference service using Buffer result and features in the BBOX
  var result=new ZOO.Feature(finalG,{"fid": "1","name": "Result1000"});
  var myProcess2 = new ZOO.Process(zoo_url,'DifferencePy');
  var myInputs2 = {InputEntity1: { type: 'complex',  value: fGJ.write(bbox.toGeometry()), mimeType: "application/json" }, InputEntity2: { type: 'complex',  value: fGJ.write(bufferResultAsJSON), mimeType: "application/json"} };
  var myOutputs2= {Result: { type: 'RawDataOutput', "mimeType": "application/json" } };
  var myExecuteResult4=myProcess2.Execute(myInputs2,myOutputs2);

  return {result: ZOO.SERVICE_SUCCEEDED, outputs: [ {name:"Result", mimeType: "application/json", value: myExecuteResult4} ] };

}