String CHILDREN_COMBINATION_APPEND = "append";

    /**
     * This default mode for combining children DOMs during merge means that where element names match, the process will
     * try to merge the element data, rather than putting the dominant and recessive elements (which share the same
     * element name) as siblings in the resulting DOM.
     */
    String DEFAULT_CHILDREN_COMBINATION_MODE = CHILDREN_COMBINATION_MERGE;

    /**
     * Preprocesses the specified bean configuration value. The optional type provided to this method is a hint (not a
     * requirement) for the preprocessor to resolve the value to a compatible value or a (string) value than can be
     * unmarshalled into that type. The preprocessor is not required to perform any type conversion but should rather
     * filter out incompatible values from its result.
     *

be modified in the following manner. The Agreement Steward reserves the right
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                    parent.getArtifactId(),
                    parent.getVersion(),
                    parent.getType(),
                    "An attached artifact must have a different ID" + " than its corresponding main artifact.");
        }
    }

    public AttachedArtifact(Artifact parent, String type, ArtifactHandler artifactHandler) {
        this(parent, type, null, artifactHandler);
    }

                    unknown = true;
                }
                if (selected == null) {
                    selected = type;
                } else if (unknown) {
                    // More than one filtered value, and we don't know how to handle at least one of them.
                    // TODO: add a plugin mechanism for allowing plugin to specify their selection algorithm.
                    return Optional.empty();

                    .relocation(model.getDistributionManagement().getRelocation())
                    .build());
        }
        // only keep repositories other than 'central'
        builder.pluginRepositories(pruneRepositories(model.getPluginRepositories()));
        builder.repositories(pruneRepositories(model.getRepositories()));
        return builder;
    }

        if (managedOriginatingArtifact != null) {
            // TODO we probably want to warn the user that he is building an artifact with
            // different values than in dependencyManagement
            if (managedVersions instanceof ManagedVersionMap) {
                /* avoid modifying the managedVersions parameter creating a new map */

            configuration). This is useful when you want to force the user to use common POM elements rather than
            plugin configurations, as in the case where you want to use the artifact's final name as a parameter. In
            this case, you want the user to modify {@code <build><finalName/></build>} rather
            than specifying a value for finalName directly in the plugin configuration section. It is also useful to

        ArtifactVersion matched = null;
        for (ArtifactVersion version : versions) {
            if (containsVersion(version)) {
                // valid - check if it is greater than the currently matched version
                if (matched == null || version.compareTo(matched) > 0) {
                    matched = version;
                }
            }
        }
        return matched;

            // all the tasks, then the thread will block waiting for all
            // those subtasks to finish.
            // This ensures the number of running workers is no more than
            // the defined parallism, while making sure the pool will not
            // be exhausted
            //
            return new ThreadPoolExecutor(