DartLsl_append_child_value typedef
        DartLsl_append_child_value =
     lsl_xml_ptr Function(lsl_xml_ptr e, Pointer<Char>  name, Pointer<Char>  value)
    
    
    
Implementation
typedef DartLsl_append_child_value =
    lsl_xml_ptr Function(
      lsl_xml_ptr e,
      ffi.Pointer<ffi.Char> name,
      ffi.Pointer<ffi.Char> value,
    );