+=item B<Version 4:> Introduced in SimGrid 3.13
+
+=over 4
+
+=item
+
+Rename the attributes describing the amount of flop that a host / peer / cluster / cabinet can deliver per second.
+
+ <host power=...> -> <host speed=...>
+
+=item
+
+In <trace_connect>, attribute kind="POWER" is now kind="SPEED".
+
+=item
+
+The DOCTYPE points to the right URL.
+
+=item
+
+Units are now mandatory in attributes. USE THE SCRIPT sg_xml_unit_converter.py TO CONVERT THIS
+
+ - speed. Old default: 'f' or 'flops'. Also defined:
+ 'Yf', 'Zf', 'Ef', 'Pf', 'Tf', 'Gf', 'Mf', 'kf'
+ 'yottaflops', 'zettaflops', 'exaflops', 'petaflops', 'teraflops', 'gigaflops', 'megaflops', 'kiloflops'
+
+ - bandwidth. Old default: 'Bps' bytes per second (or 'bps' but 1 Bps = 8 bps)
+ Also defined in bytes: 'TiBps', 'GiBps', 'MiBps', 'KiBps', 'TBps', 'GBps', 'MBps', 'kBps', 'Bps'
+ And the same in bits: 'Tibps', 'Gibps', 'Mibps', 'Kibps', 'Tbps', 'Gbps', 'Mbps', 'kbps', 'bps'
+
+ - latency. Old default: 's' second. Also defined:
+ 'w' week, 'd' day, 'h' hour, 'm' minute, 'ms' millisecond, 'us' microsecond, 'ns' nanosecond, 'ps' picosecond
+
+
+=back
+
+=item B<Version 4.1:> Introduced in SimGrid 3.16 (this is the current version).
+
+=over 4
+
+=item
+
+Rename a few tags, but in a backward-compatible manner: the old names are still accepted.
+
+ AS -> zone
+ ASroute -> zoneRoute
+ bypassAsRoute -> bypassZoneRoute
+ process -> actor
+
+=back
+
+=item Other backward-compatible changes (old syntax is still accepted) for which we did not bump the DTD version:
+
+=over 4
+
+=item
+
+Rename the FULLDUPLEX sharing into SPLITDUPLEX.
+
+=item
+
+In <host> and <peer>, rename the 'availability_file' attribute into 'speed_file'.
+
+=back
+