stack.addLast(expand(root));
    }

    @Override
    protected @Nullable T computeNext() {
      while (!stack.isEmpty()) {
        PostOrderNode<T> top = stack.getLast();
        if (top.childIterator.hasNext()) {
          T child = top.childIterator.next();
          stack.addLast(expand(child));
        } else {
          stack.removeLast();
          return top.root;
        }
      }

                Stream.of(
                                new DependencyContainer(root.child(DEPENDENCIES).orElse(null), DEPENDENCIES),
                                new DependencyContainer(
                                        root.child(DEPENDENCY_MANAGEMENT)
                                                .flatMap(dm -> dm.child(DEPENDENCIES))
                                                .orElse(null),

     */
    private SmbResource advance() {
        while (this.delegate.hasNext()) {
            final FileEntry n = this.delegate.next();
            if (this.filter == null) {
                try {
                    return adapt(n);
                } catch (final MalformedURLException e) {
                    log.error("Failed to create child URL", e);
                    continue;
                }
            }

     *
     */
    private SmbResource advance() {
        while (this.delegate.hasNext()) {
            final FileEntry fe = this.delegate.next();
            if (this.filter == null) {
                try {
                    return adapt(fe);
                } catch (final MalformedURLException e) {
                    log.error("Failed to create child URL", e);
                    continue;
                }
            }

/**
 * Utility class for handling Maven model version operations during upgrades.
 *
 * <p>This class uses domtrip internally for superior formatting preservation
 * and simplified API while maintaining the same external interface.
 */
public final class ModelVersionUtils {

    private ModelVersionUtils() {
        // Utility class
    }

    /**

 * property which happens very early.  The implementation used in this case
 * will be discovered using the JDK service mechanism.
 *
 * The default implementation will look for a {@code .mvn} child directory
 * or a {@code pom.xml} containing the {@code root="true"} attribute.
 *
 * @see DefaultRootLocator
 * @deprecated use {@code org.apache.maven.api.services.model.RootLocator} instead
 */

                            } else {
                                if (entry.getValue().isObject()) {
                                    ObjectNode child = (ObjectNode) entry.getValue();
                                    if (transform.matches(child)) {
                                        transform.transformTest((ObjectNode) currentNode);
                                    }

        if (children != null) {
            for (String child : children) {
                DirectoryCacheEntry entry = leaseManager.getCacheEntry(child);
                if (entry != null) {
                    entry.invalidate();
                }
                invalidateChildren(child);  // Recursive
            }
        }
    }
}
```

## 8. Testing Strategy

            return currentVersion.compareTo(minVersion) < 0;
        }
    }

    /**
     * Helper method to get child element text.
     */
    private String getChildText(Element parent, String childName) {
        Element child = parent.child(childName).orElse(null);
        return child != null ? child.textContentTrimmed() : null;
    }

    /**
     * Gets the list of plugin upgrades to apply.
     */

    /**
     * Returns an immutable list of all child nodes.
     *
     * @return list of child nodes, never {@code null}
     */
    @Nonnull
    List<XmlNode> children();

    /**
     * Returns the first child node with the specified name.
     *
     * @param name the name of the child node to find
     * @return the first matching child node, or {@code null} if none found
     */
    @Nullable