This collation is the same as ISO_1, but includes sorting for values in the range A0 - BF.
For compatibility with Adaptive Server Enterprise, the ISO_1 collation includes no characters for 0xA0 - 0xBF. However, the ISO Latin 1 character set on which it is based does include characters in these positions. The ISO1LATIN1 collation reflects the characters in these positions.
If you are not concerned with Adaptive Server Enterprise compatibility, ISO1LATIN1 is generally recommended instead of ISO_1.
ISO1LATIN1 is recommended for UNIX users using English or Western European languages, if you are willing to sacrifice some of the optimal performance of the default collation, ISO_BINENG.