ALPHA          =  %x41-5A/ %x61-7A

BIT            =  "0"/ "1"

CHAR           =  %x01-7F

CR             =  %x0D

CRLF           =  LF/ (CR LF)

CTL            =  %x00-1F/ %x7F

DIGIT          =  %x30-39

DQUOTE         =  %x22

HEXDIG         =  DIGIT/ "A"/ "B"/ "C"/ "D"/ "E"/ "F"

HTAB           =  %x09

LF             =  %x0A

LWSP           =  *(WSP/ CRLF WSP)

OCTET          =  %x00-FF

SP             =  %x20

VCHAR          =  %x21-7E

WSP            =  SP/ HTAB

