<http://schema.org/description>
"Alistair Lattimore posted an interesting question in the Google Webmaster Help forums about the Google Plus Button.He asked how does the Google plus button comply with the crawler directives.  If a cr"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-plus-one-button-robots-13865.html>