Library /sys$common/syshlp/helplib.hlb  —  CRTL  isxdigit
    Indicates if a character is a hexadecimal digit (0 to 9, A to F,
    or a to f) in the program's current locale.

    Format

      #include  <ctype.h>

      int isxdigit  (int character);
Additional Information: explode extract
Argument Return Values
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