*
 * <h2>Repository Configuration</h2>
 *
 * <p>Repositories can be configured at various levels:<ol>
 * <li>POM: Repositories can be specified in the {@code pom.xml} file under the {@code <repositories>} and {@code <pluginRepositories>} sections.</li>
 * <li>Settings: the {@code settings.xml} can be used to provide additional repositories in the three level of settings (user, project, installation).</li>
 * </ol>

  -->
  <pluginRepositories>
    <pluginRepository>
      <id>central</id>
      <name>Maven Central Repository</name>
      <url>${maven.repo.central}</url>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </pluginRepository>
  </pluginRepositories>


  <!-- profiles

          </description>
          <association>
            <type>Repository</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
        <field>
          <name>pluginRepositories</name>
          <version>1.3.0+</version>
          <description>
            The lists of the remote repositories for discovering plugins.
          </description>
          <association>

          </description>
          <association>
            <type>Repository</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
        <field>
          <name>pluginRepositories</name>
          <version>1.0.0</version>
          <description><![CDATA[
          The lists of the remote repositories for discovering plugins
        ]]></description>
          <association>

                result.getErrors().get(1));

        assertEquals(
                "'pluginRepositories.pluginRepository.id' is missing.",
                result.getErrors().get(2));

        assertEquals(
                "'pluginRepositories.pluginRepository.[null].url' is missing.",
                result.getErrors().get(3));
    }

    @Test

            ModelBase.Builder builder,
            ModelBase target,
            ModelBase source,
            boolean sourceDominant,
            Map<Object, Object> context) {
        builder.pluginRepositories(source.getPluginRepositories());
    }

    @Override
    protected void mergeModelBase_Repositories(
            ModelBase.Builder builder,
            ModelBase target,
            ModelBase source,

                validateRepositories(problems, profile.getRepositories(), prefix + "repositories.repository");
                validateRepositories(
                        problems, profile.getPluginRepositories(), prefix + "pluginRepositories.pluginRepository");
            }
        }

        List<Proxy> proxies = settings.getProxies();

        if (proxies != null) {
            Set<String> proxyIds = new HashSet<>();

            validateRawRepositories(problems, m.getRepositories(), "repositories.repository.", EMPTY, request);

            validateRawRepositories(
                    problems, m.getPluginRepositories(), "pluginRepositories.pluginRepository.", EMPTY, request);

            Build build = m.getBuild();
            if (build != null) {
                validate20RawPlugins(problems, build.getPlugins(), "build.plugins.plugin.", EMPTY, request);

        <!-- ====================================================================== -->

        <field xdoc.separator="blank" xml.insertParentFieldsUpTo="pluginRepositories">
          <name>build</name>
          <version>3.0.0+</version>
          <required>true</required>
          <description>Information required to build the project.</description>
          <association>

                    .build());
        }
        // only keep repositories other than 'central'
        builder.repositories(pruneRepositories(model.getRepositories()));
        builder.pluginRepositories(null);
        return builder;
    }

    private static List<Repository> pruneRepositories(List<Repository> repositories) {
        return repositories.stream()