This is a Persistence class Return the value of a named property. Return the type of a named property. This can be (Hidden,ReadOnly,Output) or any combination. Set the behaviour of the property in the property editor. 0 - default behaviour 1 - item is ready-only 2 - item is hidden Return the name of the group which the property belongs to in this class. The properties sorted in differnt named groups for convenience. Return the documentation string of the property of this class. A list of all property names