:``state_file``: File containing the state profile.
See the full description in :ref:`pf_tag_host`
+.. _pf_tag_platform:
-
+------------------------------------------------------------------
+<platform>
+------------------------------------------------------------------
+
+**Parent tags:** none (this is the root tag of every file) |br|
+**Children tags:** :ref:`pf_tag_config` (must come first),
+:ref:`pf_tag_cluster`, :ref:`pf_tag_cabinet`, :ref:`pf_tag_peer`,
+:ref:`pf_tag_zone`, :ref:`pf_tag_trace`, :ref:`pf_tag_trace_connect` |br|
+**Attributes:**
+
+:``version``: Version of the DTD, describing the whole XML format.
+ This versionning allow future evolutions, even if we
+ avoid backward-incompatible changes. The current version
+ is **4.1**. The ``simgrid_update_xml`` program can
+ upgrade most of the past platform files to the recent
+ formalism.
+
+
.. _pf_tag_prop:
------------------------------------------------------------------
