DBBRACKET
In EBCDIC, DBBRACKET adds SO and SI brackets to a DBCS-only string.
If string is not a DBCS-only string, a SYNTAX error results. That is, the input string must be an even number of bytes in length and each byte must be a valid DBCS value.
EBCDIC examples
DBBRACKET('.A.B') -> '<.A.B>'
DBBRACKET('abc') -> SYNTAX error
DBBRACKET('<.A.B>') -> SYNTAX error
