# BR-109-GST-SG

Source: https://xmlvalid.com/rules/BR-109-GST-SG

> An Universally unique Invoice Identifier (BT-SG-003) shall be formatted according to the UUID standard

- Level: error
- Rule sets: PINT SG rules (Singapore) 1.4.1
- Context: `/*/cbc:UUID`
- Test: `matches(normalize-space(.), '^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$')`

Validate a document against these rules: https://xmlvalid.com/validate