The treatment of series information in BIBFRAME 2.0 is a significant improvement over 1.0. It provides for transcription of series and subseries in a straightforward way. However, one problem remains: how to handle multiple series and to keep associated series statements and enumerations together. For example, take these series, which appear on a book: International archives of photogrammetry and remote sensing, 0256-1840 ; v. 30, pt. 3 = Internationales Archiv der Photogrammetrie und Fernerkundung ; Bd. 30, Teil 3 SPIE proceedings series, 0277-786X ; v. 2357 In 2.0, this becomes: < Instance> bf:seriesStatement "International archives of photogrammetry and remote sensing, 0256-1840 = Internationales Archiv der Photogrammetrie und Fernerkundung" ; bf:seriesStatement "SPIE proceedings series, 0277-786X" ; bf:seriesEnumeration "v. 30, pt. 3 = Bd. 30, Teil 3" ; bf:seriesEnumeration "v. 2357" . Unfortunately, there is no way to associate each of the bf:seriesEnumeration properties with its corresponding bf:seriesStatement in a way that machines understand. A possible solution is to introduce, for example, a class Series and a property bf:series, which would be used with Work or Instance and expect Series. The existing properties bf:seriesStatement, bf:seriesEnumeration, bf:subseriesStatement, and bf:subseriesEnumeration would be used with Series and expect Literal. The example would look like this: < Instance> bf:series [ a bf:Series ; bf:seriesStatement "International archives of photogrammetry and remote sensing, 0256-1840 = Internationales Archiv der Photogrammetrie und Fernerkundung" ; bf:seriesEnumeration "v. 30, pt. 3 = Bd. 30, Teil 3" ] ; bf:series [ a bf:Series ; bf:seriesStatement "SPIE proceedings series, 0277-786X" ; bf:seriesEnumeration "v. 2357" ] . Multiple subseries would be handled in the same way, with bf:subseriesStatement and bf:subseriesEnumeration used in place of bf:seriesStatement and bf:seriesEnumeration.