/**
     * This default mode for combining a DOM node during merge means that where element names match, the process will
     * try to merge the element attributes and values, rather than overriding the recessive element completely with the
     * dominant one. This means that wherever the dominant element doesn't provide the value or a particular attribute,
     * that value or attribute will be set from the recessive DOM node.
     */

          <type>String</type>
        </field>
        <field>
          <name>provides</name>
          <version>1.0.0/1.0.99</version> <!-- fake upperbound, it's inclusive -->
          <type>DOM</type> <!-- DOM for Maven 2.0.9/2.3.3 -->
          <description>
            Toolchain identification information, which will be matched against project requirements.

                    if (pluginDescriptorEntry != null) {
                        try (InputStream is = artifactJar.getInputStream(pluginDescriptorEntry)) {
                            // Note: using DOM instead of use of
                            // org.apache.maven.plugin.descriptor.PluginDescriptor
                            // as it would pull in dependency on:
                            // - maven-plugin-api (for model)

            }

            jtc.addProvideToken(key, matcher);
        }

        // populate the configuration section
        Xpp3Dom dom = (Xpp3Dom) model.getConfiguration();
        Xpp3Dom javahome = dom != null ? dom.getChild(JavaToolchainImpl.KEY_JAVAHOME) : null;
        if (javahome == null) {
            throw new MisconfiguredToolchainException(

            <multiplicity>*</multiplicity>
          </association>
        </field>
        <field>
          <name>configuration</name>
          <version>1.0.0</version>
          <type>DOM</type>
          <description>Configuration to pass to all goals run in this phase.</description>
        </field>
      </fields>
    </class>
    <class>
      <name>Execution</name>
      <version>1.0.0</version>

        }

        extensionDescriptor.setExportedPackages(parseStrings(dom.getChild("exportedPackages")));

        extensionDescriptor.setExportedArtifacts(parseStrings(dom.getChild("exportedArtifacts")));

        return extensionDescriptor;
    }

    private List<String> parseStrings(XmlNode dom) {
        List<String> strings = null;

        if (dom != null) {

the MojoDescriptor for the goal that needs to be run. In the MojoDescriptor we are interested in the <configuration/> element and <parameters/> element. From these elements we need to make a component configuration for the MojoExecution. The actual DOM like structure we create is of type PlexusConfiguration and is the type we use with the ComponentConfigurator to initialize fields in a Plexus component. Typically this is done within Plexus with the configuration supplied with component configuration,...