<custom custom1="custom field name here" custom2="custom2 field name here" />
That's not SQL - where is this coming from, and what does it have to do with adding fields? Do you need to interpret this XML structure, and then adapt your DB schema dynamically? That would be more of an XML question (altering the schema would still be done by SQL DDL statements like "ALTER TABLE ADD COLUMN").
[ August 01, 2006: Message edited by: Ulf Dittmer ]