SOLID

A continuous line, a BORDERWIDTH wide.

BROKEN

A line of dashes (3xBORDERWIDTH) long spaced a BORDERWIDTH apart. Dashes are a BORDERWIDTH wide.

Synonym: DASHED.

DOTTED

A line of dots.
The dots are round or square, depending on the value of LINEJOIN or LINEEND attribute.
The diameter of round dots is equal to the BORDERWIDTH value. The square dots are a BORDERWIDTH wide/high.
The distance between one dot and the next is the BORDERWIDTH value.