* @throws XmlPullParserException XmlPullParserException if
     * any.
     * @return CoreExtensions
     */
    private CoreExtensions parseCoreExtensions(XmlPullParser parser, boolean strict)
            throws IOException, XmlPullParserException {
        String tagName = parser.getName();
        CoreExtensions coreExtensions = new CoreExtensions();
        for (int i = parser.getAttributeCount() - 1; i >= 0; i--) {

        }
    }

    protected List<CoreExtension> validateCoreExtensionsDescriptorFromFile(
            Path extensionFile, List<CoreExtension> coreExtensions, boolean allowMetaVersions) {
        Map<String, List<InputLocation>> gasLocations = new HashMap<>();
        Map<String, List<InputLocation>> metaVersionLocations = new HashMap<>();
        for (CoreExtension coreExtension : coreExtensions) {

            Set<String> providedArtifacts,
            List<CoreExtension> configuration,
            UnaryOperator<String> interpolator)
            throws Exception {
        List<CoreExtensionEntry> extensions = new ArrayList<>();

        DependencyFilter dependencyFilter = new ExclusionsDependencyFilter(providedArtifacts);

        for (CoreExtension extension : configuration) {
            List<Artifact> artifacts =

            Set<String> providedArtifacts,
            List<CoreExtension> configuration,
            UnaryOperator<String> interpolator)
            throws Exception {
        List<LoadedCoreExtension> extensions = new ArrayList<>();

        DependencyFilter dependencyFilter = new ExclusionsDependencyFilter(providedArtifacts);

        for (CoreExtension extension : configuration) {
            List<Artifact> artifacts =

import com.google.inject.Module;
import org.apache.maven.api.Constants;
import org.apache.maven.api.ProtoSession;
import org.apache.maven.api.cli.Logger;
import org.apache.maven.api.cli.extensions.CoreExtension;
import org.apache.maven.api.services.MessageBuilderFactory;
import org.apache.maven.api.services.SettingsBuilder;
import org.apache.maven.cling.extensions.BootstrapCoreExtensionManager;