KEYWORDS = (
    # keyword, mandatory, language_support
    ( "AXIS-VERSION",   0, 0 ),
    ( "CODES",          0, 1 ),
    ( "CONTENTS",       1, 0 ),
    ( "DATA",           1, 0 ),
    ( "DECIMALS",       1, 0 ),
    ( "DESCRIPTION",    0, 1 ),
    ( "HEADING",        1, 1 ),
    ( "MATRIX",         1, 0 ),
    ( "STUB",           1, 1 ),
    ( "SUBJECT-AREA",   1, 1 ),
    ( "SUBJECT-CODE",   1, 1 ),
    ( "TITLE",          1, 1 ),
    ( "UNITS",          1, 1 ),
    ( "VALUES",         1, 1 )    
)