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You aren't mixing features, LabVIEW can save and open in XML. Extremely experimental. Don't be surprised if it falls on its face with complicated VIs, mixing libraries, classes, XControls, etc. https://lavag.org/topic/19173-anyone-else-interested-in-low-level-vi-editing-i-found-some-helpful-stuff/ Basically it shouldn't be used but is fun to look at.

The undo buffer is exposed with some scripting methods (at least the last operation and you could build it as is changes or go through all of them and then redo), but the details it gives you are very limited (it's the same string you see in the Edit menu), probably because there's no point in trying to give details. If you delete several things together, it's easier to just say "undo delete". The only other option I can think of is checking all the objects in the VI and if any of them change add something to your log and there are any number of problems with this, like: I'm not aware of any hooks for knowing about editing actions. You can use the VI Activation event to know which VI you're working on, but not anything lower. There's a Start Diagram Drag event, but I don't know what details it gives you and I don't see a corresponding drop event. Maybe an XNode could work, but I don't think they have anything which can be triggered with every change you make to their caller. Identifying the changes is difficult. You will need code to monitor every relevant property of every type of object. If a bunch of things are changed together (like if the user deletes several elements together), you need to describe that somehow. If objects are added/removed to the list, it might be difficult to realize that there's a new object in the middle and the others haven't changed. I believe there is a way to convert diagrams to XML, which might be easier, but I don't think it's complete and I don't remember the details of where it is and whether it actually works or I'm just combining several things into a feature which doesn't actually exist. Maybe there's a better way to do what you actually need. If you give more details about that people might have ideas.