[BR-109-GST-SG] An Universally unique Invoice Identifier (BT-SG-003) shall be formatted according to the UUID standard
BR-109-GST-SG
/*/cbc:UUID
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}$')