module VP:Tiny module to easily create and combine view_item propertiessig..end
typet =DGraphViewItem.shape_p list * GnomeCanvas.text_p list
val empty : tval combine : t -> t -> ttypecolor =string
val shp_color : color -> tval shp_fill_color : color -> tval txt_color : color -> tval shp_width : float -> tval txt_weight : int -> t