Builder(NetworkBuilder<N, E> networkBuilder) {
      this.mutableNetwork = networkBuilder.build();
    }

    /**
     * Adds {@code node} if it is not already present.
     *
     * <p><b>Nodes must be unique</b>, just as {@code Map} keys must be. They must also be non-null.
     *
     * @return this {@code Builder} object
     */
    @CanIgnoreReturnValue
    public ImmutableNetwork.Builder<N, E> addNode(N node) {

            }
        }

        /*
         * NOTE: This is primarily to keep backward-compat with Maven 2.x which did not validate that dependencies are
         * unique within a single POM. Upon multiple declarations, 2.x just kept the last one but retained the order of
         * the first occurrence. So when we're in lenient/compat mode, we have to deal with such broken POMs and mimic

      this.mutableGraph = graphBuilder.copy().incidentEdgeOrder(ElementOrder.<N>stable()).build();
    }

    /**
     * Adds {@code node} if it is not already present.
     *
     * <p><b>Nodes must be unique</b>, just as {@code Map} keys must be. They must also be non-null.
     *
     * @return this {@code Builder} object
     */
    @CanIgnoreReturnValue
    public Builder<N> addNode(N node) {

   * many individual lookups. Note that {@link LoadingCache#getAll} will defer to individual calls
   * to {@link LoadingCache#get} if this method is not overridden.
   *
   * @param keys the unique, non-null keys whose values should be loaded
   * @return a map from each key in {@code keys} to the value associated with that key; <b>may not
   *     contain null values</b>
   * @throws Exception if unable to load the result

   * {@inheritDoc}
   *
   * <p>Because a {@code SetMultimap} has unique values for a given key, this method returns a
   * {@link Set}, instead of the {@link java.util.Collection} specified in the {@link Multimap}
   * interface.
   */
  @Override
  Set<V> get(@ParametricNullness K key);

  /**
   * {@inheritDoc}
   *
   * <p>Because a {@code SetMultimap} has unique values for a given key, this method returns a

 * ---------------------------------------------
 * JMORRIS2        <00>  UNIQUE      Registered
 * BILLING-NY      <00>  GROUP       Registered
 * JMORRIS2        <03>  UNIQUE      Registered
 * JMORRIS2        <20>  UNIQUE      Registered
 * BILLING-NY      <1E>  GROUP       Registered
 * JMORRIS         <03>  UNIQUE      Registered
 * 
 * MAC Address = 00-B0-34-21-FA-3B
 * </pre>
 * 

   * have the provided key, an empty collection is returned.
   *
   * <p>Changes to the returned collection will update the underlying multimap, and vice versa.
   *
   * <p>Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
   * returns a {@link SortedSet}, instead of the {@link Collection} specified in the {@link
   * Multimap} interface.
   */
  @Override

   * have the provided key, an empty collection is returned.
   *
   * <p>Changes to the returned collection will update the underlying multimap, and vice versa.
   *
   * <p>Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
   * returns a {@link SortedSet}, instead of the {@link Collection} specified in the {@link
   * Multimap} interface.
   */
  @Override

 * processing by providing a means to transport information that cannot be (easily) extracted from the model itself.
 */
record ModelData(ModelSource source, Model model) {

    /**
     * Gets unique identifier of the model
     *
     * @return The effective identifier of the model, never {@code null}.
     */
    public String id() {

    /**
     * The extension of the artifact.
     *
     * @return the extension or an empty string if none, never {@code null}
     */
    @Nonnull
    String getExtension();

    /**
     * Unique id identifying this artifact
     */
    @Nonnull
    default String getId() {
        return getGroupId()
                + ":" + getArtifactId()
                + ":" + getExtension()