<http://schema.org/position>
"3"^^<http://www.w3.org/2001/XMLSchema#integer>
<http://product.rakuten.co.jp/product/%E9%99%A4%E6%B9%BF%E6%A3%92%E3%83%BB%E3%81%A4%E3%82%81%E3%81%8B%E3%81%88%EF%BC%92%EF%BC%B0/78d5287213345e146b96cd8974b2bace/>