String asString() {
            var b = new StringBuilder(groupId).append(':').append(artifactId).append(':').append(version);
            classifier.ifPresent(c -> b.append(':').append(c));
            return b.toString();
        }
Only return the projects we'd like to enforce dependencies for: the root project, its modules, their modules, etc.
vespa-enforcer-extensions/src/main/java/com/yahoo/vespa/maven/plugin/enforcer/AllowedDependencies.java