Converter.php

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<?php
namespace Magento\Framework\Mview\Config;

use Magento\Framework\Mview\View\SubscriptionInterface;

class Converter implements \Magento\Framework\Config\ConverterInterface
{
    public function convert($source)
    {
        $output = [];
        $xpath = new \DOMXPath($source);
        $views = $xpath->evaluate('/config/view');
        foreach ($views as $viewNode) {
            $data = [];
            $viewId = $this->getAttributeValue($viewNode, 'id');
            $data['view_id'] = $viewId;
            $data['action_class'] = $this->getAttributeValue($viewNode, 'class');
            $data['group'] = $this->getAttributeValue($viewNode, 'group');
            $data['subscriptions'] = [];

            foreach ($viewNode->childNodes as $childNode) {
                if ($childNode->nodeType != XML_ELEMENT_NODE) {
                    continue;
                }

                $data = $this->convertChild($childNode, $data);
            }
            $output[$viewId] = $data;
        }
        return $output;
    }

    protected function getAttributeValue(\DOMNode $input, $attributeName, $default = null)
    {
        $node = $input->attributes->getNamedItem($attributeName);
        return $node ? $node->nodeValue : $default;
    }

    protected function convertChild(\DOMNode $childNode, $data)
    {
        switch ($childNode->nodeName) {
            case 'subscriptions':
                foreach ($childNode->childNodes as $subscription) {
                    if ($subscription->nodeType != XML_ELEMENT_NODE || $subscription->nodeName != 'table') {
                        continue;
                    }
                    $name = $this->getAttributeValue($subscription, 'name');
                    $column = $this->getAttributeValue($subscription, 'entity_column');
                    $subscriptionModel = $this->getAttributeValue($subscription, 'subscription_model');
                    if (!empty($subscriptionModel)
                        && !in_array(
                            SubscriptionInterface::class,
                            class_implements(ltrim($subscriptionModel, '\\'))
                        )
                    ) {
                        throw new \InvalidArgumentException(
                            'Subscription model must implement ' . SubscriptionInterface::class
                        );
                    }
                    $data['subscriptions'][$name] = [
                        'name' => $name,
                        'column' => $column,
                        'subscription_model' => $subscriptionModel
                    ];
                }
                break;
        }
        return $data;
    }
}