OS Name,OS Specific Fact Name,Definition of the Syntax of the Fact Value,Specification of Semantics,Reference
Unix,Unix.ctime,"""time-val"" from [RFC3659]","From IEEE Std 1003.1-2004 XBD 4.7 ""File Times Update"" [http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap04.html#tag_04_07]: ""st_ctime is associated with the times that the file status is changed."" This is clarified in the operations described throughout IEEE Std 1003.1-2004 XSH 3 ""System Interfaces."" Although IEEE Std 1003.1-2004 only considers st_ctime as having second resolution, platform-specific extensions exist that provide st_ctime semantics but with sub-second resolution.  Unix.ctime values from such platforms MAY use such finer-grain resolution.",[Paul_Millar]
Unix,Unix.atime,"""time-val"" from [RFC3659]","From IEEE Std 1003.1-2004 XBD 4.7 ""File Times Update"" [http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap04.html#tag_04_07]: ""The st_atime field is associated with the times that the file data is accessed."" This is clarified in the operations described throughout IEEE Std 1003.1-2004 XSH 3 ""System Interfaces."" Although IEEE Std 1003.1-2004 only considers st_atime as having second resolution, platform-specific extensions exist that provide st_atime semantics but with sub-second resolution.  Unix.atime values from such platforms MAY use such finer-grain resolution. For performance reasons, some platforms allow operations to delay or suppress updates to st_atime.  FTP servers on such platforms MAY refrain from publishing the Unix.atime fact.",[Paul_Millar]
Unix,Unix.ownername,"""1*RCHAR"" from [RFC3659]","File owner name, as mapped from the numeric owner ID, by the operating system.",[TJ_Saunders]
Unix,Unix.groupname,"""1*RCHAR"" from [RFC3659]","File group name, as mapped from the numeric group ID, by the operating system.",[TJ_Saunders]