master.put(key, existing);
                        if (!pending.isEmpty()) {
                            predecessors.put(key, pending);
                            pending = new ArrayList<>();
                        }
                    } else {
                        pending.add(element);
                    }
                }

                        master.put(key, existing);
                        if (!pending.isEmpty()) {
                            predecessors.put(key, pending);
                            pending = new ArrayList<>();
                        }
                    } else {
                        pending.add(element);
                    }
                }

                        master.put(key, element);

                        if (!pending.isEmpty()) {
                            predecessors.put(key, pending);
                            pending = new ArrayList<>();
                        }
                    } else {
                        pending.add(element);
                    }
                }

            // even before the arguments from the command line are parsed.  Any exception
            // that would happen here should cause the build to fail at a later stage
            // (when actually parsing the POM) and will lead to a better exception being
            // displayed to the user, so just bail out and return false.
        }
        return false;
    }

/**
 * Handles deserialization of toolchains from some kind of textual format like XML.
 *
 * @since 3.3.0
 */
public interface ToolchainsReader {

    /**
     * The key for the option to enable strict parsing. This option is of type {@link Boolean} and defaults to {@code
     * true}. If {@code false}, unknown elements will be ignored instead of causing a failure.
     */
    String IS_STRICT = "org.apache.maven.toolchains.io.isStrict";

        // but to create those, proper filtering should happen via Type properties.
    }

    @Override
    public void addHandlers(Map<String, ArtifactHandler> handlers) {
        throw new UnsupportedOperationException("Adding handlers programmatically is not supported anymore");
    }

    @Deprecated
    public Set<String> getHandlerTypes() {

      <organization></organization>
      <roles>
        <role>Developer</role>
      </roles>
    </developer>
    <developer>
      <id>bwalding</id>
      <name>Ben Walding</name>
      <email>******@****.***</email>
      <organization>Walding Consulting Services</organization>
      <roles>
        <role>Developer</role>
      </roles>
    </developer>
    <developer>
      <id>mhw</id>

      <roles>
        <role>Developer</role>
      </roles>
    </developer>
    <developer>
      <id>bwalding</id>
      <name>Ben Walding</name>
      <email>******@****.***</email>
      <organization>Walding Consulting Services</organization>
      <roles>
        <role>Developer</role>
      </roles>
    </developer>
    <developer>
      <id>mhw</id>

    private List<String> defaultIds = new ArrayList<>();

    private Map<String, Profile> profilesById = new LinkedHashMap<>();

    private Properties requestProperties;

    /**
     * @deprecated without passing in the system properties, the SystemPropertiesProfileActivator will not work
     *             correctly in embedded environments.
     */
    @Deprecated
    public DefaultProfileManager(PlexusContainer container) {

            In particular this includes all subpackages. Despite the element name one can also only expose individual classes of a particular package by adding its binary name as value.
          ]]></description>
        </field>
        <field>
          <name>exportedArtifacts</name>
          <version>1.0.0</version>
          <association>