<version>4.0.0+</version>
          <association>
            <type>Site</type>
          </association>
        </field>
        <field>
          <name>downloadUrl</name>
          <version>4.0.0+</version>
          <description>
            The URL of the project's download page. If not given users will be
            referred to the homepage given by {@code url}.