:``id``: Name of the host. Must be unique on the whole platform.
:``speed``: Computational power (in flop/s).
+
If you use DVFS, provide a comma-separated list of values for each pstate (see :ref:`howto_dvfs`).
:``bw_in``: Bandwidth of the private downstream link, along with its
unit. See :ref:`pf_tag_link`.
**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|
+:ref:`pf_tag_zone`, :ref:`pf_tag_trace`, :ref:`pf_tag_trace_connect`, or
+:ref:`pf_tag_actor` in :ref:`deployment <deploy>` files.|br|
**Attributes:**
:``version``: Version of the DTD, describing the whole XML format.