Returns a LONG VARBIT that is a bitmap representing a geometry value.
      Syntax
         
            geometry-expression.ST_AsBitmap(INT x_pixels, INT y_pixels, 
                  ST_Point
                pt_ll, 
                  ST_Point
                pt_ur, VARCHAR(128) format)
      
      Parameters
         
            - 
               x_pixels – 
               The number of horizontal pixels to use
            
- 
               y_pixels – 
               The number of vertical pixels to use
            
- 
               pt_ll – 
               The lower left point of the bitmap
            
- 
               pt_ur – 
               The upper right point of the bitmap
            
- 
               format – 
               A string defining the parameters to use when converting the geometry-expression to a bitmap.
            
Returns
         LONG VARBIT Returns a LONG VARBIT encoding a bitmap of the geometry.
      Standards
         
            SQL/MM (ISO/IEC 13249-3: 2006) Vendor extension