If the value is an URI, use link
.
But note that using the content
attribute on link
is only allowed in RDFa. You probably want to use the href
attribute instead:
<link itemprop="thumbnailurl" href="/design/glogo.jpg" />
<link itemprop="sameas" href="http://examle.com" />
<link itemprop="image" href="/design/glogo.jpg" />
<link property="og:url" href="http://127.0.0.1/" />