<http://schema.org/description>
"Late Friday Google's Matt Cutts announced a Penguin update, a basic data refresh, that only should impact about 0.3% of English queries and 0.4%. of non-English queries.  In fact, it was announced and"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/google-penguin-3-15802.html>