POM has a non-empty element and the child POM has an empty element to join.
  </description>

  <properties>
    <prop0>test</prop0>
  </properties>

  <repositories>
    <repository>
      <id>equal-repo-id</id>
      <url>https://maven.apache.org/null</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>

  <artifactId>test</artifactId>
  <version>1.0</version>

  <name>MNG-7750</name>
  <description>
    Test build plugin and execution interpolation.
  </description>

  <properties>
    <prop-outside>||${project.basedir}||</prop-outside>
  </properties>

  <build>
    <plugins>
      <plugin>
        <artifactId>plugin-all-profiles</artifactId>
        <executions>
          <execution>

  <description>
    Test interpolation of ${project.baseUri}
  </description>

  <properties>
    <!-- this is where we collect all the interpolated values for the POM dump -->
    <prop1>${project.baseUri}</prop1>
  </properties>

  <modules>
    <module>module-2</module>
    <module>module-1</module>
    <module>module-3</module>
  </modules>
  <profiles>
    <profile>
      <id>a</id>
      <properties>
        <b>test-prop</b>
      </properties>
      <modules>
        <module>module-1</module>
        <module>module-4</module>
      </modules>
    </profile>
  </profiles>

    -->
    <prop0>A <![CDATA[ Test ]]> Project<![CDATA[ ]]>Property</prop0>

    <!--
    This checks the coalescing of CHARACTERS events that are interleaved with comments. Note that inner whitespace
    formed by whitespace-only events must be retained.
    -->
    <prop1><!-- X -->That's<!-- X --> <!-- X -->a<!-- X --> <!-- X -->test!<!-- X --></prop1>

    <!--

  <parent>
    <groupId>org.my.group</groupId>
    <artifactId>parent</artifactId>
  </parent>
  <artifactId>child</artifactId>
  <packaging>jar</packaging>

  <properties>
    <prop-child>bar</prop-child>
  </properties>
  <dependencies>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
    </dependency>
  </dependencies>

  <artifactId>test</artifactId>
  <version>1.0</version>

  <name>MNG-7750</name>
  <description>
    Test reporting plugin and reportSet interpolation.
  </description>

  <properties>
    <prop-outside>||${project.basedir}||</prop-outside>
  </properties>

  <reporting>
    <plugins>
      <plugin>
        <artifactId>plugin-all-profiles</artifactId>
        <reportSets>
          <reportSet>

      <version>5.10.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <profiles>
    <profile>
      <id>release</id>
      <properties>
        <prop>foo</prop>
      </properties>
      <build>
        <plugins>
          <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>