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Policy DSL

Rules

A rule is the fundamental unit of a policy. It defines what outcome occurs when conditions are met.

Rule Structure

Section titled “Rule Structure”
[Label.] A/An/The **Selector** outcome_verb outcome_value
if condition
[and/or condition]...
.

Every rule must:

  1. Start with an optional label followed by a period
  2. Have an article (A, An, or The)
  3. Reference a selector
  4. Specify an outcome (verb + value)
  5. Have at least one condition after if
  6. End with a period (.)

Outcome Verbs

Section titled “Outcome Verbs”

The outcome verb is the action word between the selector and the outcome value. The engine supports many natural verbs:

Common Verbs

Section titled “Common Verbs”
VerbExample
getsA **Person** gets approved
isA **Person** is eligible
passesA **Person** passes the test
hasA **Person** has access
receivesA **Person** receives discount
qualifies forA **Person** qualifies for membership
meetsA **Person** meets requirements

Achievement Verbs

Section titled “Achievement Verbs”

achieves, attains, earns, gains, obtains, secures, acquires

Assessment Verbs

Section titled “Assessment Verbs”

deserves, merits, warrants, demonstrates, shows, proves, establishes

State Verbs

Section titled “State Verbs”

maintains, holds, possesses, displays, exhibits, presents

Action Verbs

Section titled “Action Verbs”

provides, supplies, delivers, submits, confirms, validates, verifies

Negative Verbs

Section titled “Negative Verbs”

suffers, lacks, misses, fails

Success Verbs

Section titled “Success Verbs”

succeeds in, excels at, reaches, arrives at, comes to

Evaluation

Section titled “Evaluation”

When the engine evaluates a rule:

  1. It parses the rule text
  2. For each condition, it reads the referenced property from the data
  3. It applies the operator (comparison, validation, etc.)
  4. It combines conditions using and/or logic
  5. If all required conditions pass → result is true
  6. If any required condition fails → result is false

Interactive Example

Policy Rule
Test Data (JSON)

Comments

Section titled “Comments”

Use # for comments. Comments are ignored by the parser:

# Check if the student passes
A **Student** passes the exam
if __score__ of **Student** is greater than or equal to 60.