root/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>net.example</groupId>
  <artifactId>root</artifactId>
  <version>1.0.0</version>
  <packaging>pom</packaging>
  <name>Root</name>
   <modules>
    <module>child-a</module>
    <module>child-b</module>
    <module>child-c</module>
  </modules>
</project>

root/target/pom-transformed.xml

<?xml version="1.0" encoding="UTF-8"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>net.example</groupId>
  <artifactId>root</artifactId>
  <version>1.0.0</version>
  <packaging>pom</packaging>
  <name>Root</name>
   <modules>
    <module>child-a</module>
    <module>child-b</module>
    <module>child-c</module>
  </modules>
</project>