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Completing the Decision tab (Basic format)

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Record the if.. then.. logic of the decision tree in this array, which has three columns. The unlabeled columns are known as the comparison, action, and next value columns.

This help topic describes the basic format of the Decision tab. If you encounter a Decision tab that contains an Evaluate Parameter or Evaluate property name, see Completing the Decision tab (Advanced format).

At run time, the system evaluates the if portion of the array, starting at the top row, and continues as described here until it reaches a Return statement. If the system processes all rows but does not reach a Return statement, it returns the Otherwise value.

If the Redirect this Rule? check box on the Results tab is selected, this circumstance-qualified rule is redirected and this tab is blank.

Understanding the rows

Each text box can contain a value, a comparison operation for two values, followed by an outcome. The comparison can be between two properties or between a property and a constant value.

To make controls for a row or field visible, click that field :

  • To hide subtree structures, click Collapse All. To hide specific subtree structures, click the minus sign.
  • To show all subtree structures, click Expand All. To display specific subtrees, click the plus sign
  • To review a property for a field that contains a property reference, click the Open icon.
  • To append or delete a row, select a row and then click the Add or Delete icon, respectively.
Field Description
if / if value is Enter a comparison by using one of the six comparison operators: <, >, =, !=, >= or <=.

The value can be a constant or a Single Value property reference.

If the Action field is set to Otherwise, this field is not visible.
(action) Select an action from the selection list. The action that you choose determines which branch of this decision tree the system follows at run time when the condition to its left is reached and evaluates to true. Select a keyword:
Return
Causes this branch of the decision tree to end processing when reached. If the system finds a Return row to be true, the value in the right column of this row becomes the result of the decision tree evaluation.
Continue
Causes the next row of the decision tree to be nested within this branch. The system reflects the nesting by indenting the next row on the form display and changing the arrow to to point down to that indented row. The context for the continue statement is the same as for the current statement.
Call Decision Tree

Causes the system to evaluate another decision tree, identified in the next field.

This choice might not be present in all cases, depending on settings on the Results tab.

At run time, if this decision table evaluates in a backward-chaining context (the AllowMissingProperties parameter to the method is true), the system evaluates the called decision tree in the same way.

Call Map Value

Causes the system to evaluate a map value, identified in the next field.

This choice might not be present in all cases, depending on settings on the Results tab.

At run time, if this decision table evaluates in a backward-chaining context (the AllowMissingProperties parameter to the method is true), the system evaluates the called map value in the same way.

Call Decision Table

Causes the system to evaluate a decision table, identified in the next field.

This choice might not be present in all cases, depending on settings on the Results tab.

At run time, if this decision table evaluates in a backward-chaining context (the AllowMissingProperties parameter to the method is true), the system evaluates the called decision table in the same way.

Otherwise
Select Otherwise only as the bottom, final choice in a set of alternatives, marking the final choice. The value in the right column of this row becomes the result of this decision tree evaluation.
(next value) Identify a target based on the action value.

If you selected Return as the action and the Results tab is not blank, select one of the values listed on the Results tab.

Otherwise, enter a value or expression here that allows the evaluation of the decision tree to continue. You can reference a property on any page, but be sure to enter any page you reference on the Pages & Classes tab. Enter a value that depends on the action value keyword:

  • Return or Otherwise — Enter an expression for the result of this decision tree when this row is the final one evaluated.
  • Call Decision Tree — Select another decision tree. The result of that rule becomes the result of this rule. This choice might not be present in all cases, depending on settings on the Results tab.
  • Call Map Value — Select a map value. The result of that rule becomes the result of this rule. This choice might not be present in all cases, depending on settings on the Results tab.
  • Call Decision Table — Select a decision table. The result of that rule becomes the result of this rule. This choice might not be present in all cases, depending on settings on the Results tab.

This input field is not displayed when the action value is Continue.

To open a referenced decision tree, map value, or decision table, click the Open icon.

Expand icon Click to access an optional array of properties and values. To hide this array, click the Collapse icon . This choice might not be present in all cases, depending on settings on the Results tab.

When the decision tree evaluates and this row is the source of the results, the system also recomputes the value of the target properties that are identified in this array. Order is significant.

Property Optional. Identify a property reference to be set.
Value Enter a value for that property.
Otherwise
Return Optional. Enter an expression defining a value to return when the decision tree evaluation does not return another value. When the Allowed Results list on the Results tab is not blank, this field is required and limited to one of the constant values listed on that tab.

If this field is blank and no other return value is computed, the system returns the null value.

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