Head/Tail End Properties

Head/Tail End properties specify whether there are any special attachments to the head or the tail of a line. All parameters are specified in attributes: a @type, a @w (width of line end to width of line), and a @len (length of the end relative to the line width). By default, no head/tail end properties are applied. The @type can be one of: none, triangle, stealth, diamond, oval, arrow. @w and @len can be one of sm, med and lg corresponding to small, medium, and large respectively.