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Currently there seems to be no way of having the generated SQL for a RowSet to exclude the schema name. I suppose it it picked up from the database connection, at least for PostgreSQL that seems to be the only place one says anything about a schema. A better way would be to generate all SQL queries without schema names in table names and column names. It is rather common to let the logged in user control against which schema the query is executed. For example PostgreSQL have a server side configuration parameter "search_path" which is used to decide against which schema to execute the query. The query might end up being executed against different schemas during design-time and run-time too.
I think you're referring to visualweb, correct ?