[ibr-tdd-81] – The cac:TaxScheme element MUST NOT contain elements other than cbc:ID.
ibr-tdd-81/pxs:TaxData/pxs:ReportedTransaction/pxs:ReportedDocument/pxs:DocumentLine/cac:Item/cac:ClassifiedTaxCategory/cac:TaxSchemecount(*[not(self::cbc:ID)]) = 0