public Object put(String key,Object value){
  Object oldValue=context.getAttribute(key,ENGINE_SCOPE);
  context.setAttribute(key,value,ENGINE_SCOPE);
  return oldValue;
}

public Object put ( String key , Object value ) { Object oldValue = context . getAttribute ( key , ENGINE_SCOPE ) ; context . setAttribute ( key , value , ENGINE_SCOPE ) ; return oldValue ; }
set the key , value binding in the engine_scope of the context .
