Hi all, I think there is a bug in format-number function. Example: let $numbers := (1234.567, 789, 1234567.765) for $i in $numbers return format-number($i, "#,###.##") BaseX output: 1,234.57 789 1234,567.76 Should output: 1,234.57 789 1,234,567.76 Regards, Artur