src/it/projects/multimodule/multimodule-modulePomPropInterp/child1/pom.xml

<?xml version="1.0"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <artifactId>parent</artifactId>
    <groupId>test</groupId>
    <version>1</version>
  </parent>
  <artifactId>child1</artifactId>
  
  <properties>
    <foo>bar</foo>
  </properties>
</project>