Depending on what the directory represents ("groupId", "groupId/artifactId" or "groupId/artifactId/version"),
 the Maven Repository Metadata file contains 3 different sets of metadata:

 [[1]] in a "groupId" directory: a "groupId" directory may contain Maven plugins artifacts, which are described in metadata's <<<plugins>>> element,

 [[2]] in a "groupId/artifactId" directory: metadata describes <<<groupId>>>, <<<artifactId>>> and <<<versioning>>> element that

-->

<project>
  <modelVersion>4.0.0</modelVersion>
  <artifactId>aid</artifactId>
  <groupId>gid</groupId>
  <version>0.1</version>

  <build>
    <plugins>
      <plugin>
        <groupId>test</groupId>
        <artifactId>good</artifactId>
        <version>1.0</version>
      </plugin>
      <plugin>
        <groupId>test</groupId>
        <artifactId>mip</artifactId>
        <version>${missing.property}</version>

			</plugin>
			<plugin>
				<groupId>org.sonatype.central</groupId>
				<artifactId>central-publishing-maven-plugin</artifactId>
				<version>0.7.0</version>
				<extensions>true</extensions>
				<configuration>
					<publishingServerId>central</publishingServerId>
				</configuration>
			</plugin>
		</plugins>
	</build>
	<dependencies>
		<dependency>
			<groupId>commons-io</groupId>

      <groupId>org.apache.maven</groupId>
      <artifactId>maven-support</artifactId>
    </dependency>
    <dependency>
      <groupId>org.codehaus.plexus</groupId>
      <artifactId>plexus-xml</artifactId>
    </dependency>

    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-api</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>

        <groupId>maven-test</groupId>
        <artifactId>t06-b</artifactId>
        <version>1.1</version>
      </dependency>
      <dependency>
        <groupId>maven-test</groupId>
        <artifactId>t06-c</artifactId>
        <version>1.0</version>
      </dependency>
      <dependency>
        <groupId>maven-test</groupId>
        <artifactId>t06-d</artifactId>
        <version>1.2</version>
        <scope>test</scope>

    }

    public ArtifactModelSource(Path path, String groupId, String artifactId, String version) {
        super(path);
        this.groupId = groupId;
        this.artifactId = artifactId;
        this.version = version;
        this.hashCode = Objects.hash(groupId, artifactId, version);
    }

    public String getGroupId() {
        return groupId;
    }

  <dependencies>
    <dependency>
      <groupId>org.apache.maven</groupId>
      <artifactId>maven-api-core</artifactId>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-api</artifactId>
      <scope>test</scope>
    </dependency>
  </dependencies>

    }

    private void validateIdentity() {
        if (empty(groupId)) {
            throw new InvalidArtifactRTException(
                    groupId, artifactId, getVersion(), type, "The groupId cannot be empty.");
        }

        if (empty(artifactId)) {
            throw new InvalidArtifactRTException(
                    groupId, artifactId, getVersion(), type, "The artifactId cannot be empty.");
        }

  </properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava</artifactId>
        <version>${project.version}</version>
      </dependency>
      <dependency>
        <groupId>com.google.guava</groupId>
        <artifactId>guava-testlib</artifactId>
        <version>${project.version}</version>
      </dependency>

            assertNotNull(dependency);
            assertEquals(expectedNamespaceUri, dependency.namespaceURI());

            Element groupId = DomUtils.findChildElement(dependency, "groupId");
            assertNotNull(groupId);
            assertEquals(expectedNamespaceUri, groupId.namespaceURI());
        }

        @Test
        @DisplayName("should convert modules to subprojects in 4.1.0")