if (pom != null && !pom.equals(projectDirectory) && !pom.getParent().equals(projectDirectory)) {
            throw new IllegalArgumentException("The POM found does not belong to the given directory: " + pom);
        }
        return pom;
    }

    protected org.apache.maven.api.model.Model read(

 * ProjectManager} service.
 * <p>
 * Projects are created using the {@code ProjectBuilder} from a POM file
 * (usually named {@code pom.xml}) on the file system.
 * The {@link #getPomPath()} will point to the POM file and the
 * {@link #getBasedir()} to the directory parent containing the
 * POM file.
 * </p>
 *
 * @since 4.0.0
 * @see org.apache.maven.api.services.ProjectManager

     * Creates a new model source backed by the specified string.
     *
     * @param pom The POM's string representation, may be empty or {@code null}.
     */
    public StringModelSource(CharSequence pom) {
        this(pom, null);
    }

    /**
     * Creates a new model source backed by the specified string.
     *
     * @param pom The POM's string representation, may be empty or {@code null}.

specific language governing permissions and limitations
under the License.
-->

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  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>

  <groupId>inheritance</groupId>
  <artifactId>parent</artifactId>

specific language governing permissions and limitations
under the License.
-->

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  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>

  <groupId>inheritance</groupId>
  <artifactId>parent</artifactId>

class DefaultModelBuilderTest {

    private static final String BASE1_ID = "thegroup:base1:pom";

    private static final String BASE1 = "<project>\n" + "  <modelVersion>4.0.0</modelVersion>\n"
            + "  <groupId>thegroup</groupId>\n"
            + "  <artifactId>base1</artifactId>\n"
            + "  <version>1</version>\n"
            + "  <packaging>pom</packaging>\n"
            + "  <dependencyManagement>\n"

     * to find the POM file, else if no locator is provided, a file named 'pom.xml' needs to be
     * used by the requested model source.
     *
     * @param locator locator used to locate the pom file
     * @param relPath path of the requested model source relative to this model source POM
     * @return related model source or <code>null</code> if no such model source
     */

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.1.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.1.0 https://maven.apache.org/xsd/maven-4.1.0.xsd">
    <modelVersion>4.1.0</modelVersion>

    <groupId>test</groupId>
    <artifactId>test</artifactId>
    <version>0.1-SNAPSHOT</version>

    <dependencyManagement>
        <dependencies>

        if (project == null || Files.isDirectory(project)) {
            project = locatePom(project);
        }
        if (Files.isDirectory(project)) {
            Path pom = project.resolve("pom.xml");
            return Files.isRegularFile(pom) ? pom : null;
        } else if (Files.isRegularFile(project)) {
            return project;
        } else {
            return null;
        }
    }

/**
 * Provides the super POM that all models implicitly inherit from.
 *
 * @since 4.0.0
 */
@Experimental
public interface SuperPomProvider extends Service {

    /**
     * Gets the super POM for the specified model version.
     *
     * @param version The model version to retrieve the super POM for (e.g. "4.0.0"), must not be {@code null}.
     * @return The super POM, never {@code null}.