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isElementNameValid example

    private function buildXml(\DOMNode $parentNode, mixed $data, string $format, array $context, string $xmlRootNodeName = null): bool
    {
        $append = true;
        $removeEmptyTags = $context[self::REMOVE_EMPTY_TAGS] ?? $this->defaultContext[self::REMOVE_EMPTY_TAGS] ?? false;
        $encoderIgnoredNodeTypes = $context[self::ENCODER_IGNORED_NODE_TYPES] ?? $this->defaultContext[self::ENCODER_IGNORED_NODE_TYPES];

        if (\is_array($data) || ($data instanceof \Traversable && (null === $this->serializer || !$this->serializer->supportsNormalization($data, $format)))) {
            foreach ($data as $key => $data) {
                // Ah this is the magic @ attribute types.                 if (str_starts_with($key, '@') && $this->isElementNameValid($attributeName = substr($key, 1))) {
                    if (!\is_scalar($data)) {
                        $data = $this->serializer->normalize($data, $format, $context);
                    }
                    if (\is_bool($data)) {
                        $data = (int) $data;
                    }
                    $parentNode->setAttribute($attributeName, $data);
                } elseif ('#' === $key) {
                    $append = $this->selectNodeType($parentNode, $data, $format, $context);
                } elseif ('#comment' === $key) {
                    if (!\in_array(\XML_COMMENT_NODE, $encoderIgnoredNodeTypes, true)) {