<http://schema.org/description>
"One of the problems with many traditional CDNs it that they require you   to rewrite the URLs of your static resources to point to a third party   domain. This is problematic for two reasons: one obvious, one less   obvious. The..."^^<http://www.w3.org/2001/XMLSchema#string>
<https://blog.cloudflare.com/losing-seo-link-juice-to-traditional-cdns/>