protected function registerNode(\DOMNode $node)
    {
        if ($node->nodeType == XML_ELEMENT_NODE) {
            /** @var \DOMElement $node */
            $localContext = $this->elementProcessor->processElement($node, $this->initialContext);

            // Register the node context
            $localContextId = spl_object_hash($localContext);
            if (empty($this->contexts[$localContextId])) {
                $this->contexts[$localContextId] = $localContext;
            }

            $this->contextMap[$node->getNodePath()] = $localContextId;
        }

        return $node;
    }