code: public void setPlatform( final Architecture arch, final Os os) {
  		format.getLead().setArch( arch);
  		format.getLead().setOs( os);
  		
  		final CharSequence archName = arch.toString().toLowerCase();
  		final CharSequence osName = os.toString().toLowerCase();
  		format.getHeader().createEntry( ARCH, archName);
  		format.getHeader().createEntry( OS, osName);
  		format.getHeader().createEntry( PLATFORM, archName + "-" + osName);
  		format.getHeader().createEntry( RHNPLATFORM, archName);
  	}
docs: <b>Required Field</b>. Sets the platform related headers for the resulting RPM. The platform is specified as a
  combination of target architecture and OS.
  
  @param arch the target architecture.
  @param os the target operating system.