+* Things that will change in upcoming version 5 (TODO):
+ - The following tags will be removed:
+ - <include> spits an error since v3.18
+ - <random> and <model_prop> do nothing since a very long time
+ - <as>, <asroute>, <bypassASRoute> and <process>, deprecated in DTD4.1
+ - FULLDUPLEX sharing will be removed, deprecated in DTD4.2 (v3.19)
+
+* New in DTD version 4.1 (in SimGrid 3.16): backward compatible change (v4 files are valid v4.1 files)
+ - <zone> can be used as a synonym for the now deprecated <as>
+ - <zoneRoute> can be used as a synonym for the now deprecated <asroute>
+ - <bypassZoneRoute> can be used as a synonym for the now deprecated <bypassAsRoute>
+ - <actor> can be used as a synonym for the now deprecated <process>
+ Other backward-compatible changes for which we did not bump the DTD version.
+ - SPLITDUPLEX is the new spelling of the deprecated FULLDUPLEX (SimGrid v3.19)
+ - In <host> and <peer> availability_file is now speed_file (SimGrid v3.22)
+