IMPOSITION-TEMPLATE = "banner" / "banner-compressed" / "booklet" /
                      "none" / "signature" / "tile" /
                      IMPOSITION-POSITION / IMPOSITION-SAME-UP /
                      IMPOSITION-VENDOR

IMPOSITION-POSITION = "position_"                       ; position_...
                      { "left" / "center" / "right" }   ; HALIGN
                      "_"
                      { "top" / "middle" / "bottom" }   ; VALIGN

IMPOSITION-SAME-UP  = "same-up_"                        ; same-up_...
                      INITIAL *DIGIT "_"                ; Columns
                      INITIAL *DIGIT "_"                ; Rows
                      INITIAL *DIGIT [ "." 1*DIGIT] "x" ; Width
                      INITIAL *DIGIT [ "." 1*DIGIT]     ; Height
                      ( "in" / "mm" )                   ; Units

IMPOSITION-VENDOR   = "smi" 1*DIGIT "-" 1*KEYWORDCHAR   ; smiNNN-foo

INITIAL     = %x31-39                                   ; 1-9
KEYWORDCHAR = %x61-7A / DIGIT / "." / "-" / "_"         ; a-z, 0-9, etc.