How to use the cordova-common.xmlHelpers.mergeXml function in cordova-common

function updateConfigFilesFrom(sourceConfig, configMunger, locations) {
    events.emit('verbose', 'Generating platform-specific config.xml from defaults for android at ' + locations.configXml);

    // First cleanup current config and merge project's one into own
    // Overwrite platform config.xml with defaults.xml.
    shell.cp('-f', locations.defaultConfigXml, locations.configXml);

    // Then apply config changes from global munge to all config files
    // in project (including project's config)
    configMunger.reapply_global_munge().save_all();

    events.emit('verbose', 'Merging project\'s config.xml into platform-specific android config.xml');
    // Merge changes from app's config.xml into platform's one
    var config = new ConfigParser(locations.configXml);
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'android', /*clobber=*/true);

    config.write();
    return config;
}

function updateConfigFilesFrom(sourceConfig, configMunger, locations) {
    events.emit('verbose', 'Generating platform-specific config.xml from defaults for android at ' + locations.configXml);

    // First cleanup current config and merge project's one into own
    // Overwrite platform config.xml with defaults.xml.
    shell.cp('-f', locations.defaultConfigXml, locations.configXml);

    // Then apply config changes from global munge to all config files
    // in project (including project's config)
    configMunger.reapply_global_munge().save_all();

    events.emit('verbose', 'Merging project\'s config.xml into platform-specific android config.xml');
    // Merge changes from app's config.xml into platform's one
    var config = new ConfigParser(locations.configXml);
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'android', /*clobber=*/true);

    config.write();
    return config;
}

// If defaults.xml is present, overwrite platform config.xml with it.
    // Otherwise save whatever is there as defaults so it can be
    // restored or copy project config into platform if none exists.
    if (fs.existsSync(defaultConfig)) {
        this.events.emit('verbose', 'Generating config.xml from defaults for platform "' + this.platform + '"');
        shell.cp('-f', defaultConfig, ownConfig);
    } else if (fs.existsSync(ownConfig)) {
        shell.cp('-f', ownConfig, defaultConfig);
    } else {
        shell.cp('-f', sourceCfg.path, ownConfig);
    }

    this._munger.reapply_global_munge().save_all();

    this._config = new ConfigParser(ownConfig);
    xmlHelpers.mergeXml(cordovaProject.projectConfig.doc.getroot(),
        this._config.doc.getroot(), this.platform, true);
    // CB-6976 Windows Universal Apps. For smooth transition and to prevent mass api failures
    // we allow using windows8 tag for new windows platform
    if (this.platform == 'windows') {
        xmlHelpers.mergeXml(cordovaProject.projectConfig.doc.getroot(),
            this._config.doc.getroot(), 'windows8', true);
    }
    this._config.write();

    // Update own www dir with project's www assets and plugins' assets and js-files
    this._parser.update_www(cordovaProject.locations.www);

    // update project according to config.xml changes.
    return this._parser.update_project(this._config);
};

function updateConfigFilesFrom(sourceConfig, configMunger, locations) {
    events.emit('verbose', 'Generating platform-specific config.xml from defaults for android at ' + locations.configXml);

    // First cleanup current config and merge project's one into own
    // Overwrite platform config.xml with defaults.xml.
    shell.cp('-f', locations.defaultConfigXml, locations.configXml);

    // Then apply config changes from global munge to all config files
    // in project (including project's config)
    configMunger.reapply_global_munge().save_all();

    events.emit('verbose', 'Merging project\'s config.xml into platform-specific android config.xml');
    // Merge changes from app's config.xml into platform's one
    var config = new ConfigParser(locations.configXml);
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'android', /*clobber=*/true);

    config.write();
    return config;
}

events.emit('verbose', 'Generating platform-specific config.xml from defaults for windows at ' + ownConfig);
        shell.cp('-f', defaultConfig, ownConfig);
    } else if (fs.existsSync(ownConfig)) {
        shell.cp('-f', ownConfig, defaultConfig);
    } else {
        shell.cp('-f', sourceCfg, ownConfig);
    }

    // Then apply config changes from global munge to all config files
    // in project (including project's config)
    configMunger.reapply_global_munge().save_all();

    events.emit('verbose', 'Merging project\'s config.xml into platform-specific windows config.xml');
    // Merge changes from app's config.xml into platform's one
    var config = new ConfigParser(ownConfig);
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'windows', /*clobber=*/true);

    config.write();
    return config;
}

if (fs.existsSync(defaultConfig)) {
        events.emit('verbose', 'Generating config.xml from defaults for platform "windows"');
        shell.cp('-f', defaultConfig, ownConfig);
    } else if (fs.existsSync(ownConfig)) {
        shell.cp('-f', ownConfig, defaultConfig);
    } else {
        shell.cp('-f', sourceCfg, ownConfig);
    }

    // Then apply config changes from global munge to all config files
    // in project (including project's config)
    configMunger.reapply_global_munge().save_all();

    // Merge changes from app's config.xml into platform's one
    var config = new ConfigParser(ownConfig);
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'windows', /*clobber=*/true);
    // CB-6976 Windows Universal Apps. For smooth transition and to prevent mass api failures
    // we allow using windows8 tag for new windows platform
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'windows8', /*clobber=*/true);

    config.write();
    return config;
}

if (fs.existsSync(defaultConfig)) {
        events.emit('verbose', 'Generating config.xml from defaults for platform "windows"');
        shell.cp('-f', defaultConfig, ownConfig);
    } else if (fs.existsSync(ownConfig)) {
        shell.cp('-f', ownConfig, defaultConfig);
    } else {
        shell.cp('-f', sourceCfg, ownConfig);
    }

    // Then apply config changes from global munge to all config files
    // in project (including project's config)
    configMunger.reapply_global_munge().save_all();

    // Merge changes from app's config.xml into platform's one
    var config = new ConfigParser(ownConfig);
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'windows', /*clobber=*/true);
    // CB-6976 Windows Universal Apps. For smooth transition and to prevent mass api failures
    // we allow using windows8 tag for new windows platform
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'windows8', /*clobber=*/true);

    config.write();
    return config;
}

function updateConfigFilesFrom(sourceConfig, configMunger, locations) {
    events.emit('verbose', 'Generating platform-specific config.xml from defaults for android at ' + locations.configXml);

    // First cleanup current config and merge project's one into own
    // Overwrite platform config.xml with defaults.xml.
    shell.cp('-f', locations.defaultConfigXml, locations.configXml);

    // Then apply config changes from global munge to all config files
    // in project (including project's config)
    configMunger.reapply_global_munge().save_all();

    events.emit('verbose', 'Merging project\'s config.xml into platform-specific android config.xml');
    // Merge changes from app's config.xml into platform's one
    var config = new ConfigParser(locations.configXml);
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'android', /*clobber=*/true);

    config.write();
    return config;
}

shell.cp('-f', ownConfig, defaultConfig);
    } else {
        shell.cp('-f', sourceCfg, ownConfig);
    }

    // Then apply config changes from global munge to all config files
    // in project (including project's config)
    configMunger.reapply_global_munge().save_all();

    // Merge changes from app's config.xml into platform's one
    var config = new ConfigParser(ownConfig);
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'windows', /*clobber=*/true);
    // CB-6976 Windows Universal Apps. For smooth transition and to prevent mass api failures
    // we allow using windows8 tag for new windows platform
    xmlHelpers.mergeXml(sourceConfig.doc.getroot(),
        config.doc.getroot(), 'windows8', /*clobber=*/true);

    config.write();
    return config;
}

shell.cp('-f', defaultConfig, ownConfig);
    } else if (fs.existsSync(ownConfig)) {
        shell.cp('-f', ownConfig, defaultConfig);
    } else {
        shell.cp('-f', sourceCfg.path, ownConfig);
    }

    this._munger.reapply_global_munge().save_all();

    this._config = new ConfigParser(ownConfig);
    xmlHelpers.mergeXml(cordovaProject.projectConfig.doc.getroot(),
        this._config.doc.getroot(), this.platform, true);
    // CB-6976 Windows Universal Apps. For smooth transition and to prevent mass api failures
    // we allow using windows8 tag for new windows platform
    if (this.platform == 'windows') {
        xmlHelpers.mergeXml(cordovaProject.projectConfig.doc.getroot(),
            this._config.doc.getroot(), 'windows8', true);
    }
    this._config.write();

    // Update own www dir with project's www assets and plugins' assets and js-files
    this._parser.update_www(cordovaProject.locations.www);

    // update project according to config.xml changes.
    return this._parser.update_project(this._config);
};