<https://larryullman.com/forums/index.php?/topic/29-part-3-physical-products-ch8-creating-a-catalog/#comment-75>
<http://schema.org/text>
"Then perhaps there's an error in your .htaccess file that prevents it from being parsed. Or perhaps the rules are working but they're not doing what you expect them to. "
<https://larryullman.com/forums/index.php?/topic/29-part-3-physical-products-ch8-creating-a-catalog/#comment-308>