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322 M. Adams
Fig. 11.22 Creating a new
Rule Tree

default). Clicking the New button adds a conclusion for the new rule. If the currently
selected rule type is “Selection,” a worklet can be added as a conclusion in the
manner described in Sect. 11.10.1.
If it is one of the exception rule types, the New button will display the Draw
Conclusion dialog, allowing for the graphical creation of an exlet process model
comprising a sequence of tasks (or primitives), as explained in detail in Sect. 11.10.4
below. When the conclusion sequence has been defined and the dialog closed, a
textual representation of it will be displayed in the Conclusion panel.
Once the new rule node has been given a condition and conclusion, and option-
ally some cornerstone data and a description, clicking the Add Rule button adds the
rule to the tree. The new node will be displayed at the selected position on the tree
with the relevant colored node icon indicating whether it is a true or false node of
its parent. New potential node add-points will also be displayed. Figure 11.22 is an
example of a newly created tree that has had several nodes added.
The add rule procedure may be repeated for however many rule nodes are to be
added by clicking on the appropriate yellow (potential) nodes. When node addition
is complete, clicking the Add Tree button will add the tree just created to the tree set
selected (via the selected Rule Type and, if applicable, Task Name lists).
Once the newly created tree has been added to the selected tree set, administrators
will no longer be able to add nodes to the tree via the New Rule Set form. This is to
protect the integrity of the rule set. As each subsequent rule will be added because
of an exceptional case or where the selected worklet does not fit the context of a
case instance, the preferred method is to create the base rule set and then add rules
as they become necessary via the Add Rule form as described earlier. In this way,
added rules are based on real case data and so are guaranteed to be valid. In a similar
vein, there is no option to modify or delete a rule node within a tree once the tree has
been added to the rule set, since to allow it would destroy the integrity of the rule