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| Prefix | Namespace IRI |
|---|---|
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| rdfs | http://www.w3.org/2000/01/rdf-schema# |
| n6 | http://en.wikipedia.org/wiki/List_of_tornadoes_in_the_tornado_outbreak_of_May_18%E2%80%9321, |
| rdf | http://www.w3.org/1999/02/22-rdf-syntax-ns# |
| owl | http://www.w3.org/2002/07/owl# |
| prov | http://www.w3.org/ns/prov# |
| xsdh | http://www.w3.org/2001/XMLSchema# |