<https://pyra-handheld.com/boards/threads/category-issue-for-pnd-for-emulator.71963/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://pyra-handheld.com/boards/threads/category-issue-for-pnd-for-emulator.71963/#post-1231641>