<http://schema.org/about>
"Our mothers taught us (well, some of us) to send thank-you notes and to bring a gift when staying at someone's house or cottage as a guest.  But what to bring?  You don't know their taste, or you don't like their taste or you know that they don't need"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/style/organic-goodies-make-perfect-green-thank-you-gift.html>