<https://edsource.org/2011/imagine-teachers-as-free-agents-before-adopting-pay-for-performance/5451>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://edsource.org/2011/imagine-teachers-as-free-agents-before-adopting-pay-for-performance/5451>