public function postMap(array $config, ContextualizerInterface $contextualizer)
    {
        $container = $contextualizer->getContainer();

        // complex parameters dependencies
        foreach (array_merge($config['siteaccess']['list'], array_keys($config['siteaccess']['groups'])) as $scope) {
            $this->addComplexParametersDependencies('io.url_prefix', $scope, $container);
            $this->addComplexParametersDependencies('io.legacy_url_prefix', $scope, $container);
            $this->addComplexParametersDependencies('io.root_dir', $scope, $container);
        }

        // we should only write for default, and for sa/sa groups/global IF they have a declared value
        $scopes = array_merge(
            array('default'),
            $config['siteaccess']['list'],
            array_keys($config['siteaccess']['groups'])
        );
        foreach ($scopes as $scope) {
            // post process io.url_prefix for complex settings
            $postProcessedValue = $this->postProcessComplexSetting('io.url_prefix', $scope, $container);
            if (is_string($postProcessedValue)) {
                $contextualizer->setContextualParameter('io.url_prefix', $scope, $postProcessedValue);
            }

            // post process io.legacy_url_prefix for complex settings
            $postProcessedValue = $this->postProcessComplexSetting('io.legacy_url_prefix', $scope, $container);
            if (is_string($postProcessedValue)) {
                $contextualizer->setContextualParameter('io.legacy_url_prefix', $scope, $postProcessedValue);
            }

            // post process io.root_dir for complex settings
            $postProcessedValue = $this->postProcessComplexSetting('io.root_dir', $scope, $container);
            if (is_string($postProcessedValue)) {
                $contextualizer->setContextualParameter('io.root_dir', $scope, $postProcessedValue);
            }
        }
    }