<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://prima.cdnds.net/assets/16/09/980x490/landscape-1456838095-children-sliding-stairs.jpg>
<http://www.prima.co.uk/leisure/a35044/saying-no-to-children-other-parents-rules-setting-boundaries/>