<http://schema.org/about>
"It's easy to get a play set made of sustainable wood and recycled plastic. Depending on your skills, it could be easy to assemble, too."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/your-home/remodeling-design/questions/what-are-my-options-for-eco-friendly-backyard-play-sets>