[basex-talk] Snapshoting in baseX

Hi everybody, this is rather a general question than a concrete issue or a bug report: Does baseX provide any snapshoting-alike functionality, i.e. the possibility to automatically save (potentially) affected elements *before* an updating transaction is performed? We have a (existing) GUI which is used to edit data stored in a baseX database. For this GUI, we want to add undo/redo functionality for the user. Snapshoting would be a straightforward approach, but any other hints or ideas are also welcome (maybe using events?). Thanks in advance, Simon