Value MUST be part of code list 'NA codes' or 'PackagingMarkedLabelAccreditationCode'.
/ubl:Catalogue/cac:CatalogueLine/cac:Item/cac:Certificate/cbc:CertificateTypeCode(some $code in $clNA satisfies $code = normalize-space(text())) or (some $code in $clPackagingMarkedLabelAccreditationCode satisfies $code = normalize-space(text()))