The Delete Node(s) action deletes the node/s selected in the action's XPath expression.
The definition in the screenshot above is for an OnFinishedEditing event of a combo box that updates the $XML1Products/Selection element. The context node is Products. The action deletes the child Product element that has content, which when converted to lowercase matches the (lowercase) content of the Selection element. In the screenshot below, mobiletogether has been selected in the combo box and becomes the value of the Selection element. The Product element containing the text "MobileTogether" has been deleted.