The type of the function is national.
Must be an integer. Argument-2 identifies the source code page for the conversion. Full support for a CCSID value other than
1208 (UTF-8) requires the installation of the appropriate IBM CCSID conversion table; see
Installing CCSID Tables for more information. The table name required for a CCSID of
nnn is
IBM-nnn. For example, to support a CCSID value of 37, you should install table IBM-37. If the required table is not installed, the
conversion is carried out using the default EBCDIC or ASCII code page (according to whether the given CCSID is EBCDIC or not).
If argument-2 is unspecified, each character that has no corresponding internal national representation is converted to a
national space.