*/
    String DEFAULT_SELF_COMBINATION_MODE = SELF_COMBINATION_MERGE;

    @Nonnull
    String getName();

    @Nonnull
    String getNamespaceUri();

    @Nonnull
    String getPrefix();

    @Nullable
    String getValue();

    @Nonnull
    Map<String, String> getAttributes();

    @Nullable
    String getAttribute(@Nonnull String name);

    @Nonnull

     *         {@link ProjectBuildingException}.
     */
    MavenProject getProject();

    /**
     * Gets the problems that were encountered during the project building.
     *
     * @return The problems that were encountered during the project building, can be empty but never {@code null}.
     */
    List<ModelProblem> getProblems();

    /**

     */
    public MojoException(Object source, String shortMessage, String longMessage) {
        super(shortMessage);
        this.source = source;
        this.longMessage = longMessage;
    }

    /**
     * Construct a new <code>MojoExecutionException</code> exception wrapping an underlying <code>Throwable</code>
     * and providing a <code>message</code>.
     */
    public MojoException(String message, Throwable cause) {

            MavenExecutionRequest request, List<MavenProject> projects, Set<String> projectSelectors) {
        Set<MavenProject> resolvedOptionalProjects = new LinkedHashSet<>();
        Set<String> unresolvedOptionalSelectors = new HashSet<>();
        File baseDirectory = getBaseDirectoryFromRequest(request);
        for (String selector : projectSelectors) {
            Optional<MavenProject> optSelectedProject =

          <type>boolean</type>
          <description>
            Marks this Mojo as being thread-safe, i.e. the Mojo safely supports concurrent execution during parallel
            builds. Mojos without this annotation will make Maven output a warning when used during a parallel build
            session.
            @since Maven 3.0.
          </description>
          <defaultValue>false</defaultValue>
        </field>

            <phase>initialize</phase>
            <goals>
              <goal>reset</goal>
            </goals>
            <configuration>
              <logFile>target/exec.log</logFile>
              <string>test</string>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

  <reporting>
    <plugins>
      <plugin>

    }

    public ModelSource getSource(String groupId, String artifactId) {
        Set<ModelSource> sources = mappedSources.get(groupId + ":" + artifactId);
        if (sources == null) {
            return null;
        }
        return sources.stream()
                .reduce((a, b) -> {
                    throw new IllegalStateException(String.format(

        <groupId implementation="java.lang.String">${groupId}</groupId>
        <artifactId implementation="java.lang.String">${artifactId}</artifactId>
        <version implementation="java.lang.String">${version}</version>
        <goal implementation="java.lang.String">${goal}</goal>
      </configuration>
      <requirements>
        <requirement>

                builder.distributionManagement(dist.withSite(site.withUrl(normalize(site.getUrl()))));
            }
        }

        return builder.build();
    }

    private String normalize(String url) {
        return urlNormalizer.normalize(url);
    }

/**
 * An exception thrown during the reading of an xml file.
 *
 * @since 4.0.0
 */
@Experimental
public class XmlReaderException extends MavenException {

    private final Location location;

    /**
     * @param message the message for the exception
     * @param e the exception itself
     */
    public XmlReaderException(String message, Location location, Exception e) {