java-tutorials/maven-modules/maven-parent-pom-resolution/maven-parent-pom-aggregator/parent-pom-module2/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <artifactId>parent-pom-module2</artifactId>
    <packaging>pom</packaging>

    <parent>
        <groupId>com.baeldung.maven-parent-pom-resolution</groupId>
        <artifactId>parent-pom-module1</artifactId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../parent-pom-module1/pom.xml</relativePath>
        <!-- The parent pom is resolved to project a's pom.xml -->
    </parent>

    <modules>
        <module>parent-pom-module3</module>
    </modules>

</project>