.orElse(null);
    }

    private String getVersion(Model model) {
        String version = model.getVersion();
        if (version == null && model.getParent() != null) {
            version = model.getParent().getVersion();
        }
        return version;
    }

    void put(Path pomFile, Model model) {
        modelsByPath.put(pomFile, model);
        modelsByGa

import org.apache.maven.model.building.ArtifactModelSource;
import org.apache.maven.model.building.DefaultModelProblem;
import org.apache.maven.model.building.FileModelSource;
import org.apache.maven.model.building.ModelSource2;
import org.apache.maven.model.building.ModelSource3;
import org.apache.maven.model.resolution.UnresolvableModelException;
import org.apache.maven.model.root.RootLocator;

import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.model.Model;

/**
 * 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}.

     *
     * @param model The model whose duplicate elements should be merged, must not be {@code null}.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */

/**
 * Caches auxiliary data used during model building like already processed raw/effective models. The data in the cache
 * is meant for exclusive consumption by the model builder and is opaque to the cache implementation. The cache key is
 * formed by a combination of group id, artifact id, version and tag. The first three components generally refer to the

import org.apache.maven.api.model.Exclusion;
import org.apache.maven.api.model.InputLocation;
import org.apache.maven.api.model.InputLocationTracker;
import org.apache.maven.api.model.Model;
import org.apache.maven.api.model.Parent;
import org.apache.maven.api.model.Plugin;
import org.apache.maven.api.model.PluginExecution;
import org.apache.maven.api.model.PluginManagement;
import org.apache.maven.api.model.Profile;

        problems.clear();
        problems = validator.validate(model2);
        assertEquals(2, problems.size());

        repo = repo.withUrl("http://xxx.xxx.com");
        model2 = Settings.newBuilder()
                .profiles(List.of(prof.withRepositories(List.of(repo))))
                .build();
        problems.clear();
        problems = validator.validate(model2);
        assertEquals(1, problems.size());

/**
 * A test which demonstrates maven's recursive inheritance where
 * a distinct value is taken from each parent contributing to
 * the final model of the project being assembled. There is no
 * overriding going on amongst the models being used in this test:
 * each model in the lineage is providing a value that is not present
 * anywhere else in the lineage. We are just making sure that values

import java.util.Map;

import org.apache.maven.RepositoryUtils;
import org.apache.maven.api.DependencyScope;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.model.Dependency;
import org.apache.maven.model.DependencyManagement;
import org.apache.maven.model.Exclusion;
import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RepositorySystemSession;

                new MojoExecutionXPathContainer(executions.get(1)).getValue("configuration/models[1]/model"));
        assertEquals(
                "src/main/mdo/supplemental-model.mdo",
                new MojoExecutionXPathContainer(executions.get(4)).getValue("configuration/models[1]/model"));
    }

    @Test
    void testLifecycleQueryingUsingADefaultLifecyclePhase() throws Exception {