PluginExecution existing = merged.get(key);
                    if (existing != null) {
                        element = mergePluginExecution(existing, element, sourceDominant, context);
                    }
                    merged.put(key, element);
                }

                builder.executions(merged.values());
            }
        }

        @Override

import org.apache.maven.api.services.model.*;

/**
 * Handles normalization of a model.
 *
 */
@Named
@Singleton
public class DefaultModelNormalizer implements ModelNormalizer {

    private DuplicateMerger merger = new DuplicateMerger();

    @Override
    public Model mergeDuplicates(Model model, ModelBuilderRequest request, ModelProblemCollector problems) {
        Model.Builder builder = Model.newBuilder(model);

        PomTestWrapper pom = buildPom("merged-plugin-exec-goals-order/wo-plugin-mgmt/sub");

        assertEquals(5, ((List<?>) pom.getValue("build/plugins[1]/executions[1]/goals")).size());
        assertEquals("child-a", pom.getValue("build/plugins[1]/executions[1]/goals[1]"));
        assertEquals("merged", pom.getValue("build/plugins[1]/executions[1]/goals[2]"));

                        .artifactId(pluginInfo.artifactId)
                        .name(pluginInfo.name)
                        .build()))
                .build();
    }

    @Override
    protected void merge(Metadata recessive) {
        List<Plugin> recessivePlugins = recessive.getPlugins();
        List<Plugin> plugins = metadata.getPlugins();
        if (!recessivePlugins.isEmpty() || !plugins.isEmpty()) {

            versioning.latest(artifact.getBaseVersion());
        }

        metadata.versioning(versioning.build());

        return metadata.build();
    }

    @Override
    protected void merge(Metadata recessive) {
        Versioning original = metadata.getVersioning();

        Versioning.Builder versioning = Versioning.newBuilder(original);
        versioning.lastUpdated(fmt.format(timestamp));

            <ul>
            <li>{@code combine.children}: available values are {@code merge} (default) and {@code append},</li>
            <li>{@code combine.self}: available values are {@code merge} (default) and {@code override}.</li>
            </ul>

            @see <a href="https://maven.apache.org/pom.html#Plugins">POM Reference documentation</a>

                        .map(Object::toString)
                        .toList();
                request.getModelRepositoryHolder().merge(model.getRepositories(), false);
                List<String> newRepos = request.getModelRepositoryHolder().getRepositories().stream()
                        .map(Object::toString)
                        .toList();

                    PluginExecution existing = merged.get(key);
                    if (existing != null) {
                        element = mergePluginExecution(element, existing, sourceDominant, context);
                    }
                    merged.put(key, element);
                }

                builder.executions(merged.values());
            }
        }
    }

                merged.put(key, element);
            }

            for (Repository element : recessive) {
                Object key = getRepositoryKey().apply(element);
                if (!merged.containsKey(key)) {
                    merged.put(key, element);
                }
            }

            builder.repositories(merged.values());
        }
    }

    @Override

                    .build();
            model.update(merger.merge(model.getDelegate(), lifecycleModel));
        }
    }

    /**
     *  The domain-specific model merger for lifecycle bindings
     */
    protected static class LifecycleBindingsMerger extends MavenModelMerger {

        private static final String PLUGIN_MANAGEMENT = "plugin-management";

        public Model merge(Model target, Model source) {