Advanced: Modules, PRIORITY, QUERY¶

Modules¶

Modules package reusable rule libraries.

MODULE acme.compliance
USE acme.common

Benefits:

Reuse and composition.
Namespace separation.
Cleaner policy/rule governance.

PRIORITY¶

Priority resolves competing clauses for the same rule relation.

CREATE RULE classify PRIORITY 1 AS MATCH (n) WHERE n.risk > 0.8 YIELD KEY n, 'high' AS level
CREATE RULE classify PRIORITY 2 AS MATCH (n) YIELD KEY n, 'normal' AS level

QUERY (Goal-Directed)¶

QUERY asks for targeted answers rather than full materialization-first workflows.

QUERY classify WHERE n.name = 'service-a' RETURN level

Choosing Bottom-Up vs Goal-Directed¶

Bottom-up: broad materialization, repeated downstream reuse.
Goal-directed: targeted questions with narrower evaluation focus.