If the type/length is negative, and the absolute number is two or greater, then that feature is a line and is followed by the absolute number of coordinate pairs. The basic structure for a line object is similar to a region, but the line does not have to have the last coordinate equal to the first. The basic representation for a line is as follows:
"NAME", "NAME2", "ID", -n
x1, y1 x2, y2
.
.
xn, ynIn a BNA file, lines do not have islands or lakes.