* try to merge the element attributes and values, rather than overriding the recessive element completely with the
     * dominant one. This means that wherever the dominant element doesn't provide the value or a particular attribute,
     * that value or attribute will be set from the recessive DOM node.
     */
    String DEFAULT_SELF_COMBINATION_MODE = SELF_COMBINATION_MERGE;

    @Nonnull

            // TODO Should this be changed for MNG-6754 too?
            snapshot.setTimestamp(getDeploymentTimestamp());

            // we update the build number anyway so that it doesn't get lost. It requires the timestamp to take effect
            try {
                int buildNumber = resolveLatestSnapshotBuildNumber(artifact, localRepository, remoteRepository);

  <artifactId>test</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>Maven Integration Test :: MNG-3838</name>
  <description>
    Verify that using the same dependency for different plugins doesn't blow up the project builder.
  </description>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-a</artifactId>

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <!-- Shared parent. Doesn't define a lot of things about Apache like general mailing lists, but does
       define the settings common to all projects at Apache -->
  <groupId>org.apache</groupId>
  <artifactId>apache</artifactId>
  <version>1</version>
  <packaging>pom</packaging>

     * for finalName directly in the plugin configuration section. It is also useful to ensure that - for example - a
     * List-typed parameter which expects items of type Artifact doesn't get a List full of Strings.
     *
     * @return <code>true</code> if the user should not be allowed to configure the parameter directly
     */
    boolean readonly() default false;

     * @throws IOException if any
     * @throws XmlPullParserException if any
     */
    Settings buildSettings() throws IOException, XmlPullParserException;

    /**
     * @param useCachedSettings if true, doesn't reload the user settings
     * @return a <code>Settings</code> object from the user settings file.
     * @throws IOException if any
     * @throws XmlPullParserException if any
     */

- extension artifact missing
- artifact metadata retrieval problem
- version range violation
- circular dependency
- artifact missing
- artifact retrieval exception
- md5 checksum doesn't match for local artifact, need to redownload this
- POM doesn't exist for a goal that requires one
- parent POM missing (in both the repository + relative path)
- component not found

Plugins:
- plugin metadata missing

  </parent>

  <artifactId>child</artifactId>

  <name>Maven Integration Test :: MNG-3979</name>
  <description>
    Test that during inheritance the merging/joining of subtrees with equal identifier doesn't crash if the parent
    POM has a non-empty element and the child POM has an empty element to join.
  </description>

  <properties/>

  <repositories>
    <repository>
      <id>equal-repo-id</id>

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <!-- Shared parent. Doesn't define a lot of things about Apache like general mailing lists, but does
       define the settings common to all projects at Apache -->
  <groupId>org.apache</groupId>
  <artifactId>apache</artifactId>
  <version>3</version>
  <packaging>pom</packaging>

            version = constructVersion(repoMetadata.getVersioning(), artifact.getBaseVersion());
        }

        if (version == null) {
            // use the local copy, or if it doesn't exist - go to the remote repo for it
            version = artifact.getBaseVersion();
        }

        // TODO also do this logging for other metadata?
        // TODO figure out way to avoid duplicated message