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318 M. Adams
Fig. 11.18 The Choose
Worklet dialog

to a selection tree, the process to add the rule is that explained below. Refer to
Sect. 11.10.3 for details on adding a conclusion for the exception rule types.
For a selection rule tree, when the New button is clicked, a dialog is displayed
that comprises a drop-down list containing the names of all the worklets in the
Worklet Repository (refer Fig. 11.18). An appropriate worklet for this rule may be
chosen from the list, or, if none of the existing worklets are suitable, a new worklet
specification may be created.
Clicking the New button on this dialog will open the YAWL Editor so that a new
worklet specification can be created. When the new worklet is saved and the Editor
is closed, the name of the newly created worklet will be displayed and selected in
the worklet drop-down list. Once all the fields for the new rule are complete and
valid, clicking the Save button adds the new rule to the rule tree in the appropriate
location.

Table 11.1 Operator order of precedence
Precedence Operators Type
1 = Arithmetic
2 C
3 D <<D Comparison
> >D Š D
4 & Logical AND
Logical OR
j
Š Logical NOT