+ (VoltaBracketSpanner
+ . (
+ (axes . (1))
+ (side-axis . ,Y)
+ (direction . ,UP)
+ (padding . 1)
+ (Y-offset . ,ly:side-position-interface::y-aligned-side)
+ (outside-staff-priority . 100)
+ (Y-extent . ,ly:axis-group-interface::height)
+ (X-extent . ,ly:axis-group-interface::width)
+ (no-alignment . ,#t)
+ (meta . ((class . Spanner)
+ (interfaces . (side-position-interface
+ axis-group-interface)))
+ )))