We respect that the choice of mode is up to the site developer.
The links below provide guidance on how to validate schemas.
FATCA-VALID-FILE-NOTIFICATION-2.4 (8 KB) - Main schema for the valid file notifications.
FATCA Report Notification XML Samples_2.4: FATCA-IDES-File Wrapper-1.1 (135 KB) - Base schema for common data elements and data types for converting non-XML formatted files into an XML format.
The Microsoft XSD Inference utility is used to create an XML Schema definition language (XSD) schema from an XML instance document.
The input must be a well-formed XML instance document, and not an XML fragment.