[1] XProc: An XML Pipeline Language (5/11/2010, 1:38:07 PM 版) <http://www.w3.org/TR/2010/REC-xproc-20100511/#xproc-media-type>
[2] XProc 2.0: An XML Pipeline Language (7/21/2016, 5:35:49 AM) <https://www.w3.org/TR/2016/NOTE-xproc20-20160721/#xproc-media-type>
Google search: application/xproc+xml