/**
     * Use an XPath string to select a single node.
     *
     * @param contextNode The node to start searching from.
     * @param expression A valid XPath string.
     * @return The first node found that matches the XPath, or null.
     *
     * @throws XPathExpressionException if an XPath expression error occurs.
     */

  @Override
  public Set<N> adjacentNodes(N node) {
    return delegate().adjacentNodes(node);
  }

  @Override
  public Set<N> predecessors(N node) {
    return delegate().predecessors(node);
  }

  @Override
  public Set<N> successors(N node) {
    return delegate().successors(node);
  }

  @Override
  public int degree(N node) {
    return delegate().degree(node);
  }

  @Override

     *         specified dependency node's children and proceed to its next sibling
     */
    boolean enter(@Nonnull Node node);

    /**
     * Ends the visit to the specified dependency node.
     *
     * @param node the dependency node to visit
     * @return <code>true</code> to visit the specified dependency node's next sibling, <code>false</code> to skip the
     *         specified dependency node's next siblings and proceed to its parent

        case Node.ELEMENT_NODE:
            appendElement((Element) node, buf);
            break;
        case Node.TEXT_NODE:
            appendText((Text) node, buf);
            break;
        case Node.CDATA_SECTION_NODE:
            appendCDATASection((CDATASection) node, buf);
            break;
        case Node.ENTITY_REFERENCE_NODE:
            appendEntityReference((EntityReference) node, buf);

### Node Binaries

filename | sha512 hash
-------- | -----------
[kubernetes-node-linux-amd64.tar.gz](https://dl.k8s.io/v1.18.20/kubernetes-node-linux-amd64.tar.gz) | 9f4d52317e8ceed178c60a75210a5a00f6548d3c6bb41e6adf2a1b0eee2944de4570be08e4da1bfb982983329bc3c1eeb4ff99dda82352cda8fcd9aeada9c70c

### Node Binaries

filename | sha512 hash
-------- | -----------
[kubernetes-node-linux-amd64.tar.gz](https://dl.k8s.io/v1.21.14/kubernetes-node-linux-amd64.tar.gz) | 35a28acfdbf15265b4d463ecf86cb7bd9c1261fbb2a273d83971e5080050048a4c970dd1daa341c9682d667040ff32be27ec9c6c2e36f51b3d32e673007255d1

### Node Binaries

filename | sha512 hash
-------- | -----------
[kubernetes-node-linux-amd64.tar.gz](https://dl.k8s.io/v1.13.12/kubernetes-node-linux-amd64.tar.gz) | `b575e22344c7cf15c3073e452c6eca140178f238f8eee262433a89e042ee23feb6e9f7e8dffb9d3d6de88658b9d50d9bdcfeee3c9aea4230d0e84a8058cf70b0`

### Node binaries

filename | sha512 hash
-------- | -----------
[kubernetes-node-linux-amd64.tar.gz](https://dl.k8s.io/v1.17.17/kubernetes-node-linux-amd64.tar.gz) | 40518e641695635e05845fca17faef6b21adfc21484c29b8c30f3478adf6fd6d1f7014ac82526109e00f8007ebb1ba5a3570f0bfc7eca64eb66c097658b3f791

[kubernetes-node-linux-arm64.tar.gz](https://dl.k8s.io/v1.7.16/kubernetes-node-linux-arm64.tar.gz) | `87e768d59fd71a3a558ea5775bedec1f74f983af9a568ccec52f9394431db547`
[kubernetes-node-linux-ppc64le.tar.gz](https://dl.k8s.io/v1.7.16/kubernetes-node-linux-ppc64le.tar.gz) | `cece0dddbe6cac79ccc5c490d3132a85f72a4da6daf3c88202ad864dff5c98aa`

 *
 * @author James Sexton
 * @param <N> Node parameter type
 * @param <E> Edge parameter type
 */
abstract class AbstractDirectedNetworkConnections<N, E> implements NetworkConnections<N, E> {
  /** Keys are edges incoming to the origin node, values are the source node. */
  final Map<E, N> inEdgeMap;

  /** Keys are edges outgoing from the origin node, values are the target node. */
  final Map<E, N> outEdgeMap;