+## This class describes "Exchange Variables", i.e. a structure containing all
+# the necessary information to exchange variables between a supervision code
+# and a computation code.
+#
+# \param inputVarList This instance attribute is a list of \b Variable objects,
+# describing the input variables for the computation code.
+#
+# \param outputVarList This instance attribute is a list of \b Variable objects,
+# describing the output variables for the computation code.
+#
+# \param refEntry This instance attribute is optional and can be used to store a
+# reference to a Salome entry containing an "Exchange Variable" SObject
+# that was used to build this one (when the current object has been built
+# by selecting variables of interest in a list of potential variables).
+# \ingroup study_exchange_vars