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Comparison Rule Sets allow for the construction of complex business rules such as (Rule1 AND Rule2) OR (Rule3 AND Rule4). |
Overview
Rule Sets are constructed by creating one or more Comparison Rules and then joining them together as a complex boolean expression.
When you click the link next to a property that is a Comparison Rule set, the following editor is opened:
A rule set has the following properties:
- Description - this is an English name used to describe the rule. It only appears in the configuration and is not viewable by practitioners.
- Rules - this is the JSON string that defines the rule set.
- The rule set is represented as an expression tree in JSON syntax. Each node of the tree is either a
- Single comparison rule
- Conjunction [multiple rules ANDed together] or a disjunction [multiple rules ORed together]
- Disjunction [multiple rules ORed together]
- Nodes can be combined to create complex combinations of ANDs and ORs.
- See the table below for examples.
- The rule set is represented as an expression tree in JSON syntax. Each node of the tree is either a
- Comparison Rules in use - At the bottom of the rule set you can manage the Comparison Rules.
- There is:
- A list of Comparison Rules used in this rule set with their Rule Id followed by
- The option to Add a new Rule.
- Clicking the [Add a new Rule] link creates a new rule with a temporary negative number as its Rule Id and the name "undefined value."
- Clicking the name of the rule opens the Comparison Rules editor to add or update the rule.
- When creating the JSON for the Rules replace the actual Rule Id for the "<Rule Id>" shown in the examples below.
- When the Rule Set is saved, the new Comparison Rules which were assigned a negative number will be reassigned a positive number.
- There is:
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Scenario | Syntax Example |
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Always evaluate as TRUE | (leave the JSON field blank) |
Single comparison rule | { "nodeType": "Single", "ruleId": <RuleId> } |
Multiple rules, all of which must match ("AND") | { "nodeType": "And", "rules": [ |
Multiple rules, any of which must match ("OR") | { "nodeType": "Or", "rules": [ |
Complex expression e.g., (Rule1 OR Rule2) AND (Rule3 OR Rule4) | { "nodeType": "And", "rules": [ |
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