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

• x0000B802 bsd/hfs/hfscommon/headers/system/MacOSStubs.h:398
• XIOParamPtr bsd/hfs/hfscommon/headers/system/MacOSStubs.h:1078
• XVolumeParamPtr bsd/hfs/hfscommon/headers/system/MacOSStubs.h:1117