concatenator char "/" +
separator    char " " /
lowercase    yes/no

verbose      yes/no (with vendor name prefixed or not)  Sun Solaris (with [] parts)
normal                                                  Solaris     (without [] parts)
concise      yes/no (reduced to single word)            Solaris     (only <> parts or if no <> without [] and without special chars)

RPM Filenames: --rpm ==> --sep="" --conc="+" --format="%{ap}-%{sp}" 
ia32-lsb2.0
ix86-redhat9
i686-gnu+linux2.2.3+2.4.22

RPM .spec checks: --check ==> --sep="-" --conc="/" --format="%{at}:%{st}" 
ia32-lsb-2.0
ix86-redhat-9
i686-gnu+linux-2.2.3+2.4.22

Web Identifiers: --id ==> --sep="-" --conc="+" --format="%{at}/%{st}" 
IA32/LSB2.0
ix86/RedHat-9
i686/GNU+Linux-2.2.3+2.4.22

README/INSTALL files: --human ==> --sep=" " --conc="/" --format="%{sp} (%{ap})" 
LSB2.0 (IA32)
RedHat 9 (i686)
GNU/Linux 2.2.3/2.4.22 (i686)

--all ==> --class --prod --tech
--class ==> Xc
--prod  ==> Xp
--tech  ==> xt

--verbose                ==> []
--normal (or nothing)    ==> {}
--concise                ==> <>

hardware architecture
- class       %ac       SPARC     SPARC     IA32  IA64  HPPA     Alpha    PPC         M68K
- product     %ap       sparc32   sparc64   ix86  ia64  hppa     alpha    PowerPC5    m6800x
- technology  %at       sun4c     sun4u     i686  ia64  hppa2.0  alphav5  PowerPC50x0 M68004
operating system
- class       %sc       SVR5            SVR4      4.4BSD              4.4BSD      LSB2.0                  4.2BSD
- product     %sp       OpenUNIX 8.0    Solaris9  FreeBSD4.8          NetBSD1.6   RedHat9                 Tru64 5.1B
- technology  %st       UnixWare/7.1.3  SunOS/5.9 FreeBSD/4.8-STABLE  NetBSD/1.6.1 GNU/Linux 2.2.3/2.4.22 OSF1/5.01

"[Sun ]<Solaris> 9"
"[SCO ]UnixWare 7.1[.3]"
"FreeBSD 4.8[-STABLE]"
"<Debian>[ GNU/Linux] 2.2[.5]"
"GNU/<Linux> [3.3.1/]2.2.4/<2.4>.22"

%(xx) with all parenthesis
%[xx]
%{xx} %xx
%<xx>

/:+ " ":-
linux-2.4

--------------------------
    capacity
        - CPU speed
        - RAM size
        - Disk size
        - Network bandwidth
cp_cpu
cp_ram
cp_dsk
cp_net

platform