<http://schema.org/description>
"A Google Webmaster Help thread has an interesting question, does Google use QR codes for discovering new content and pages?  Can GoogleBot read QR codes and follow through to the data, URL or whatever"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-qr-codes-index-17371.html>