From FreeCAD Documentation
- DataObjects: List of objects to be connected. Generally, at least two objects are needed, but a single compound containing the shapes to connect will do as well. (as of FreeCAD v0.17.8053, this property is not displayed in Property editor, and can only be accessed via Python).
- DataRefine: Sets whether to apply Refine operation or not, to the final shape. The default value is determined by a 'Automatically refine shape after boolean operation' checkbox in PartDesign Preferences.
- DataTolerance: "fuzziness" value. This is an extra tolerance to apply when searching for intersections, in addition to tolerances stored in the input shapes.