Typedefs starting with `x' in bsd/hfs/hfscommon/headers/system

• x0000B802 bsd/hfs/hfscommon/headers/system/MacOSStubs.h:371
• XIOParamPtr bsd/hfs/hfscommon/headers/system/MacOSStubs.h:1050
• XVolumeParamPtr bsd/hfs/hfscommon/headers/system/MacOSStubs.h:1089