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>
      <releases>
        <checksumPolicy>ignore</checksumPolicy>
      </releases>

            <execution>
              <id>modello-site-docs</id>
              <goals>
                <goal>xdoc</goal>
                <goal>xsd</goal>
              </goals>
              <phase>none</phase>
            </execution>
          </executions>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>

  <profiles>
    <profile>
      <id>reporting</id>
      <reporting>

  <description>
    A test plugin to assist testing of Maven core.
  </description>
  <inceptionYear>2009</inceptionYear>

  <distributionManagement>
    <repository>
      <id>maven-core-it</id>
      <url>file:///${basedir}/repo</url>
    </repository>
  </distributionManagement>

  <properties>
    <maven.test.skip>true</maven.test.skip>
    <updateReleaseInfo>true</updateReleaseInfo>

  </issueManagement>
  <ciManagement>
    <system>Jenkins</system>
    <url>https://ci-maven.apache.org/job/Maven/job/maven-box/job/maven/</url>
  </ciManagement>
  <distributionManagement>
    <site>
      <id>apache.website</id>
      <url>scm:svn:https://svn.apache.org/repos/asf/maven/website/components/${maven.site.path}</url>
    </site>
    <downloadUrl>https://maven.apache.org/download.html</downloadUrl>
  </distributionManagement>

            <model>src/main/mdo/profiles.mdo</model>
            <model>src/main/mdo/paramdoc.mdo</model>
          </models>
        </configuration>
        <executions>
          <execution>
            <id>modello</id>
            <goals>
              <goal>java</goal>
              <goal>xpp3-reader</goal>
              <goal>xpp3-writer</goal>
            </goals>
          </execution>
        </executions>

          <execution>
            <id>Outside ||${project.basedir}||</id>
            <configuration>
              <plugin-all-profiles-out>Outside ||${project.basedir}||</plugin-all-profiles-out>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

  <profiles>
    <profile>
      <id>activeProfile</id>
      <properties>

          </configuration>
          <executions>
            <execution>
              <id>site-docs</id>
              <phase>pre-site</phase>
              <goals>
                <goal>xdoc</goal>
                <goal>xsd</goal>
              </goals>
            </execution>
            <execution>
              <id>standard</id>
              <goals>
                <goal>java</goal>

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

  <properties/>

  <repositories>
    <repository>
      <id>equal-repo-id</id>
      <url>file:///${basedir}/null</url>
      <snapshots/>
      <releases/>
    </repository>
  </repositories>

  <build>
    <plugins>
      <plugin>

        <groupId>org.codehaus.modello</groupId>
        <artifactId>modello-maven-plugin</artifactId>
        <version>1.0-alpha-14</version>
        <executions>
          <execution>
            <id>archetype-common</id>
            <goals>
              <goal>java</goal>
              <goal>xsd</goal>
              <goal>xpp3-reader</goal>
              <goal>xpp3-writer</goal>
            </goals>

  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.modello</groupId>
        <artifactId>modello-maven-plugin</artifactId>
        <executions>
          <execution>
            <id>plugin</id>
            <goals>
              <goal>velocity</goal>
            </goals>
            <phase>generate-sources</phase>
            <configuration>