<http://schema.org/description>
"A Google Groups thread asks the question on why when a advertisers sets his AdWords campaigns to  \"Rotate: Show ads more evenly\" in the campaign settings, does it not always rotate 100% evenly?The adv"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/archives/018345.html>