<http://schema.org/about>
"Most people focus on kitchen scraps, but that's just the very tip of the composting iceberg. Did you know you could also include the following?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/your-home/organic-farming-gardening/stories/81-things-you-can-compost?page=1>