<http://schema.org/about>
" The resurgence in knitting has created great demand for eco friendly yarns for those knitters who who want to reduce their eco footprint. Green options says: synthetic yarns are also bad for the earth, since they are made from petroleum. Vegans object"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/green-architecture/eco-friendly-yarn.html>