Increased quality through validation of XML sources using T0 XSD as well as validation of XML results using specific versions of T0 DTD

While the existing pipelines validate all XML source documents, XML results were not validated. Simply validating the XML results manually during stylesheet development and subsequently applying correct XSLT transformations while relying on valid results was sufficient. The nature of the source-to-result transformation for the XML documents is not one-to-one, but one-to-many – producing up to twelve versions of XML result documents for one source document. With regard to the quality of the results, none of these twelve XML results should appear in the Zip archive if at least one result document is not valid with respect to its specific version of T0 DTD.