The General Data Type Conversion routine converts OpenVMS
    standard atomic or string data described by a source descriptor
    to OpenVMS standard atomic or string data described by a
    destination descriptor. This conversion is supported over a
    subset of the OpenVMS standard data types.

    Format

      LIB$CVT_DX_DX  source-item ,destination-item

                     [,word-integer-dest-length]

  Additional Information (explode) :

• Returns
• Arguments