<https://www.avforums.com/threads/lenspen-sensorklear-ii-pen-loupe-diy-sensor-cleaning.1365324/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.avforums.com/threads/lenspen-sensorklear-ii-pen-loupe-diy-sensor-cleaning.1365324/>