urn:oasis:names:specification:ubl:dsig:enveloped:xades urn:oasis:names:specification:ubl:signature:1 urn:oasis:names:specification:ubl:signature:Invoice not(//ancestor-or-self::ext:UBLExtensions) not(//ancestor-or-self::cac:Signature) not(//ancestor-or-self::cac:AdditionalDocumentReference[cbc:ID='QR']) {0} {1} {2} {3}