http://compojure.googlegroups.com/web/hiccup_cheatsheet.html?gda=lcoAaEgAAAC9ClVW2F8tAMDAPdQ2ZC4-IY9zp5IwnQA3qHyIYNlGRoqb7lnzYYGH2lkPt_s99BZ3Vb0rL0TI2pkQqoSDTBNYGjVgdwNi-BwrUzBGT2hOzg