ForewordIntroductionScopeNormative referencesTerms and definitionsTerms — defined in ISO 14306:2017Abbreviated terms — defined in ISO 14306:2017Support of industrial use cases and need for scope extensionFile formatGeneralFile structure — defined in PSI 14-1:2016File Header — defined in PSI 14-1:2016TOC Segment — defined in PSI 14-1:2016Data Segment — defined in PSI 14-1:2016Precise Geometry SegmentEnhancement of the ISO 14306:2017 functionalitiesGeneralReading 9.5 JT — Format changesPolygon Set LOD ElementBetter compressionGeneralLMZA replaces ZLIBEnhanced Int32 Compressed Data PaketEnhanced Compressed Auxiliary Fields ArrayRationalized Topomesh Compressed Rep DataAdded per field final flags to JT attributesJT and AP242 BO Model XMLHistory and evolution of JT (informativ)Bibliography