<plugins>
        <plugin>
          <groupId>org.codehaus.modello</groupId>
          <artifactId>modello-maven-plugin</artifactId>
          <executions>
            <execution>
              <id>modello-site-docs</id>
              <goals>
                <goal>xdoc</goal>
                <goal>xsd</goal>
              </goals>
              <phase>none</phase>
            </execution>
          </executions>

        <field>
          <name>phase</name>
          <version>1.0.0+</version>
          <type>String</type>
          <description>
            Defines a default phase to bind a Mojo execution to if the user does not explicitly set a phase in the POM.
            &lt;p>&lt;b>Note:&lt;/b> This will not automagically make a Mojo run when the plugin declaration is added

              {@code war},
              {@code ear},
              {@code pom}.
            Plugins can create their own packaging, and
            therefore their own packaging types,
            so this list does not contain all possible types.
          </description>
          <type>String</type>
          <defaultValue>jar</defaultValue>
        </field>

          <models />
        </configuration>
        <executions>
          <execution>
            <!-- This step is required to generate xdoc, and does not generate java code -->
            <id>modello-site-doc</id>
            <goals>
              <goal>xdoc</goal>
            </goals>
            <phase>pre-site</phase>
            <configuration>
              <version>1.0.0</version>

                <param>generateLocationClasses=true</param>
              </params>
            </configuration>
          </execution>
          <execution>
            <id>modello-site-docs</id>
            <goals>
              <goal>xdoc</goal>
              <goal>xsd</goal>
            </goals>
            <phase>generate-resources</phase>
            <configuration>

                <param>minimalVersion=4.0.0</param>
              </params>
            </configuration>
          </execution>
          <execution>
            <id>modello-site-docs</id>
            <phase>none</phase>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

          </description>
        </field>
      </fields>
    </class>

    <!-- TODO: reproduced from maven-model/maven.mdo, instead should inherit code and link to external docs -->
    <class java.clone="deep">
      <name>RepositoryBase</name>
      <version>1.0.0+</version>
      <superClass>IdentifiableBase</superClass>
      <description>

              <params>
                <param>packageModelV4=org.apache.maven.api.metadata</param>
              </params>
            </configuration>
          </execution>
          <execution>
            <id>plugin-doc</id>
            <goals>
              <goal>xdoc</goal>
              <goal>xsd</goal>
            </goals>
            <phase>generate-resources</phase>
            <configuration>