L.4.8.5.2.1 Custom Dashes

Custom dashes allow full flexibility in expressing any dashing scheme. Custom dashes are also known as dash stop lists, a:ds, due to the way the custom dashes are expressed. An element of the list specifies two attributes: d for the length of the dash relative to line width, and sp for length of the space relative to line width. Any number of elements can be combined into a dash stop list for full generality in expressing dashing schemes.