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+PRFilePrivate
+=============
+
+
+Layer-dependent implementation data.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   typedef struct PRFilePrivate PRFilePrivate;
+
+
+Description
+-----------
+
+A layer implementer should collect all the private data of the layer in
+the :ref:`PRFilePrivate` structure. Each layer has its own definition of
+:ref:`PRFilePrivate`, which is hidden from other layers as well as from the
+users of the layer.