xo_type
  
   xo_type is an object with the following attributes:
  
  
   • int type – Identifies the data type of the column
  
  
   • int length – Contains the maximum length for a character data type.
  
  
   • int prec – Contains the number of digits of mantissa precision.
  
  
   • int scale – Total number of significant digits to the right of the decimal point.
  
  
   • int radix – Radix of PREC if TYPE is one of the approximate numeric types.
  
  
   • int null – Contains 0 (XO_NO_NULLS) if not nullable, 1 (XO_NULLABLE) if column is nullable.