[3] EPSPDF
[4] application/postscript 参照。
application/postscript
[1] Postscript VS PDF <http://pc8.2ch.net/test/read.cgi/tech/1097857352/>
[2] IRC logs: freenode / #whatwg / 20090927 (2009-11-30 23:26:32 +09:00 版) <http://krijnhoetmer.nl/irc-logs/whatwg/20090927#l-309>