<http://schema.org/description>
"A common issue for e-commerce sites is what to do when an item goes out of stock.  Do you delete the page?  Do you redirect the page somewhere else?  Do you just tell the user the item is out of stock"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/018167.html>