+Apple System Log (ASL) messages, sent using the
+.Xr asl 3
+library routines permit the facility name to be an arbitrary string,
+although users of the system are encouraged to use a
+.Dq reverse ICANN
+naming convention, for example
+.Dq com.apple.system.syslog .
+Since these facility names may contain dot characters, the names may be enclosed in
+either singe quote or double quote characters.
+.Pp
+If
+.Em facility
+is terminated by an asterisk (``*''),
+then facility names are matched using the prefix characters preceeding the asterisk.
+For example,
+.Pp
+.Dq 'com.apple.abc.*'
+.Pp
+matches any facility with the prefix ``com.apple.abc.''.
+These wildcard facility names typically must be enclosed in single or double quotes characters.
+.Pp