maven occur, the maven inheritance model must be pinned against a particular
  modelVersion. This is required so that a change from modelVersion 4.0.0 to
  4.1.0 doesn't cause compatibility problems with users who have not upgraded
  their projects. It also allows for a certain amount of legacy support into the
  future. Therefore, we should rename this file from pom.xml in the maven-core

    </mailingList>
    <mailingList>
      <name>Maven User List</name>
      <subscribe>users******@****.***</subscribe>
      <unsubscribe>users******@****.***</unsubscribe>
      <post>users@maven.apache.org</post>
      <archive>http://mail-archives.apache.org/mod_mbox/maven-users</archive>
      <otherArchives>
        <otherArchive>http://www.mail-archive.com/users@maven.apache.org/</otherArchive>

    </mailingList>
    <mailingList>
      <name>Maven User List</name>
      <subscribe>users******@****.***</subscribe>
      <unsubscribe>users******@****.***</unsubscribe>
      <post>users@maven.apache.org</post>
      <archive>http://mail-archives.apache.org/mod_mbox/maven-users</archive>
      <otherArchives>
        <otherArchive>http://www.mail-archive.com/users@maven.apache.org/</otherArchive>

                        relocation.global ? "User global relocation" : "User project relocation");
                LOGGER.debug(
                        "The artifact {} has been relocated to {}: {}",
                        original,
                        result,
                        relocation.global ? "User global relocation" : "User project relocation");
                return result;
            }
        }

     */
    Properties getSystemProperties();

    /**
     * Sets the user properties to use for interpolation and profile activation. The user properties have been
     * configured directly by the user on his discretion, e.g. via the {@code -Dkey=value} parameter on the command
     * line.
     *
     * @param userProperties The user properties, may be {@code null}.
     * @return This request, never {@code null}.
     */

     */
    Map<String, String> getSystemProperties();

    /**
     * Gets the user properties to use for interpolation and profile activation. The user properties have been
     * configured directly by the user on his discretion, e.g. via the {@code -Dkey=value} parameter on the command
     * line.
     *
     * @return The user properties, never {@code null}.
     */
    Map<String, String> getUserProperties();

    /**

        </field>
        <field>
          <name>notifiers</name>
          <version>4.0.0+</version>
          <description>Configuration for notifying developers/users when a build is unsuccessful,
            including user information and notification mode.</description>
          <association>
            <multiplicity>*</multiplicity>
            <type>Notifier</type>
          </association>

    </mailingList>
    <mailingList>
      <name>Commons User List</name>
      <subscribe>commons-user******@****.***</subscribe>
      <unsubscribe>commons-user******@****.***</unsubscribe>
      <archive>http://nagoya.apache.org/eyebrowse/SummarizeList?listName=commons-user@jakarta.apache.org</archive>
    </mailingList>
  </mailingLists>
  <developers>
    <developer>

        Source userSource = request.getUserToolchainsSource().orElse(null);
        PersistedToolchains user = readToolchains(userSource, request, problems);

        PersistedToolchains effective = toolchainsMerger.merge(user, global, false, null);

        if (hasErrors(problems)) {
            throw new ToolchainsBuilderException("Error building toolchains", problems);
        }

     *
     * @return the global Toolchains source or {@code null} if none
     */
    @Nonnull
    Optional<Source> getGlobalToolchainsSource();

    /**
     * Gets the user Toolchains source.
     *
     * @return the user Toolchains source or {@code null} if none
     */
    @Nonnull
    Optional<Source> getUserToolchainsSource();

    @Nonnull
    static ToolchainsBuilderRequest build(