[1] OWL 2 Web Ontology Language XML Serialization (2009-10-27 23:15:01 +09:00 版) <http://www.w3.org/TR/2009/REC-owl2-xml-serialization-20091027/#Appendix:_Internet_Media_Type.2C_File_Extension.2C_and_Macintosh_File_Type>