+ (BalloonTextItem
+ . ((stencil . ,ly:balloon-interface::print)
+ (text . ,(grob::calc-property-by-copy 'text))
+ (X-offset . ,(grob::calc-property-by-copy 'X-offset))
+ (Y-offset . ,(grob::calc-property-by-copy 'Y-offset))
+ (meta . ((class . Item)
+ (interfaces . (text-interface
+ font-interface))))))