As there is a System Event "OnDocFormDelete" it would be nice to have one for undeleting documents like OnDocFormUndelete.
I have been missing this in a recent project where i wrote the document tree into an XML-File using OnDocFormSave and OnDocFormDelete. But if a document is undeleted none of this events are executed and the XML-File is not updated. Thanks to the Forum i was able to implement it myself which was very easy.