public function process(\DOMDocument $xml)
    {
        $ignoreQry = '//tag[@name=\'' . $this->tag . '\']';

        $xpath = new \DOMXPath($xml);
        $nodes = $xpath->query($ignoreQry);

        /** @var \DOMElement $node */
        foreach ($nodes as $node) {
            $remove = $node->parentNode->parentNode;

            // sometimes the parent node of the entity-to-be-removed is already
            // gone; for instance when a File docblock contains an @internal and
            // the underlying class also contains an @internal.
            // Because the File Docblock is found sooner, it is removed first.
            // Without the following check the application would fatal since
            // it cannot find, and then remove, this node from the parent.
            if (!isset($remove->parentNode)) {
                continue;
            }

            $remove->parentNode->removeChild($remove);
        }

        return $xml;
    }