| Description | The highest value of ExpressionIndex ever assigned on
this system. Preferrably this value is preserved across
system reboots. A managed system that is unable to
store expressions across reboots need not preserve this
value across reboots.
If all expression-creating applications cooperate, they
may use this to avoid reusing an ExpressionIndex. To
do so, attempt creation of a new entry with this
value + 1 as the value of expExpressionIndex.
Although reusing ExpressionIndexes could lead to an
application receiving a misunderstood value, it is a
matter of local management policy whether to reuse them. |