<https://www.datasciencelearner.com/how-to-create-a-bar-chart-from-a-dataframe-in-python/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.datasciencelearner.com/how-to-create-a-bar-chart-from-a-dataframe-in-python/>