- Fixing or improving documentation.
  - Improvements to Maven configuration.

Guidelines for any code contributions:

1.  Any significant changes should be accompanied by tests. The project already
    has good test coverage, so look at some existing tests if you're unsure how
    to go about it.
2.  All contributions must be licensed Apache 2.0 and all files must have a copy

import eu.maveniverse.domtrip.maven.Coordinates;
import eu.maveniverse.domtrip.maven.MavenPomElements;
import org.apache.maven.api.cli.mvnup.UpgradeOptions;
import org.apache.maven.api.di.Named;
import org.apache.maven.api.di.Priority;
import org.apache.maven.api.di.Singleton;
import org.apache.maven.cling.invoker.mvnup.UpgradeContext;

import static eu.maveniverse.domtrip.maven.MavenPomElements.Elements.ARTIFACT_ID;

 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.internal.impl;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;

 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.api.services;

import java.nio.file.Path;
import java.nio.file.Paths;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.artifact;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;

import org.apache.maven.artifact.versioning.VersionRange;

/**
 * ArtifactUtils
 */
public final class ArtifactUtils {

 * under the License.
 */
package org.apache.maven.graph;

import java.util.ArrayList;
import java.util.Collection;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.maven.execution.ProjectDependencyGraph;
import org.apache.maven.project.MavenProject;

/**

 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.cling.invoker.mvnup;

import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;

import org.apache.commons.cli.ParseException;
import org.apache.maven.api.cli.mvnup.UpgradeOptions;
import org.apache.maven.cling.MavenUpCling;
import org.codehaus.plexus.classworlds.ClassWorld;
import org.junit.jupiter.api.Test;

import org.apache.maven.artifact.versioning.VersionRange;
import org.apache.maven.model.Dependency;
import org.apache.maven.model.Exclusion;
import org.apache.maven.model.Plugin;
import org.apache.maven.model.Repository;
import org.apache.maven.model.RepositoryPolicy;
import org.apache.maven.repository.ArtifactDoesNotExistException;
import org.apache.maven.repository.ArtifactTransferFailedException;
import org.apache.maven.repository.ArtifactTransferListener;

import org.apache.commons.cli.ParseException;
import org.apache.maven.api.cli.Options;
import org.apache.maven.api.cli.ParserRequest;
import org.apache.maven.api.services.Interpolator;
import org.apache.maven.api.services.InterpolatorException;
import org.apache.maven.jline.MessageUtils;

import static java.util.Objects.requireNonNull;
import static org.apache.maven.cling.invoker.CliUtils.createInterpolator;

import org.apache.maven.wagon.UnsupportedProtocolException;
import org.apache.maven.wagon.Wagon;
import org.apache.maven.wagon.authentication.AuthenticationException;
import org.apache.maven.wagon.authentication.AuthenticationInfo;
import org.apache.maven.wagon.authorization.AuthorizationException;
import org.apache.maven.wagon.events.TransferListener;
import org.apache.maven.wagon.observers.ChecksumObserver;
import org.apache.maven.wagon.proxy.ProxyInfo;