Only document objects for which GetSelectionId returns a non-null string will get its selection handles generated. The SVG group element will have an "id" attribute that is the selection id prefixed by "H". (The SVG element corresponding to the document object will have the same "id" attribute value, except prefixed with "I".) The generated elements will have the "display" attribute set to "none", unless the object is currently selected in the View. This method does nothing if SupportsSelection is false or if Scripting is false, thereby reducing the size of the SVG document.