Optimize your ODT exports with the IsStrictSchema11 property. Ensure strict compliance with ODT 1.1 or enable 1.2 compatibility for best results....Document doc = new Document ( MyDir + "Rendering.docx" ); OdtSaveOptions...IsStrictSchema11 = exportToOdt11Specs }; doc . Save ( ArtifactsDir + "OdtSaveOptions...