Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            Options options) {
        super(
                parserRequest,
                cwd,
                installationDirectory,
                userHomeDirectory,
                userProperties,

            Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            O options) {
        super(
                parserRequest,
                cwd,
                installationDirectory,
                userHomeDirectory,
                userProperties,

        this.topDirectory = requireNonNull(topDirectory);
        this.rootDirectory = rootDirectory;

        this.in = in;
        this.out = out;
        this.err = err;
        this.coreExtensions = coreExtensions;
    }

    @Override
    public ParserRequest parserRequest() {
        return parserRequest;
    }

    @Override
    public Path cwd() {
        return cwd;
    }

    @Override

            Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            List<String> jvmArguments,
            MavenOptions options) {
        super(
                parserRequest,
                cwd,
                installationDirectory,

  xml.namespace="http://maven.apache.org/EXTENSIONS/${version}"
  xml.schemaLocation="http://maven.apache.org/xsd/core-extensions-${version}.xsd">

  <id>core-extensions</id>
  <name>CoreExtensions</name>
  <description><![CDATA[
  <p>This is a reference for the Core Extensions descriptor.</p>
  <p>The default location for the Core Extensions descriptor file is <code>${maven.projectBasedir}/.mvn/extensions.xml</code></p>

        R invokerRequest = context.invokerRequest;
        if (invokerRequest.coreExtensions().isEmpty()
                || invokerRequest.coreExtensions().get().isEmpty()) {
            return Collections.emptyList();
        }

        List<CoreExtension> extensions = invokerRequest.coreExtensions().get();
        ContainerConfiguration cc = new DefaultContainerConfiguration()

     *
     * @return an {@link Optional} containing the list of core extensions, or empty if not configured
     */
    @Nonnull
    Optional<List<CoreExtension>> coreExtensions();

    /**
     * Returns the options associated with this invocation request.
     *
     * @return the options object
     */
    @Nonnull
    O options();