To draw a circle.
R This is the radius of the circle to be drawn
COLOR This is the color the circle should be drawn in. Defaults to black.
FILLCOLOR This is the color the circle should be filled in with. Defaults to none.
WIDTH This is the width of the line used to draw the circle. Defaults to 1 pixel.
<circle R="1i" color="255,0,0"/>
This will cause a 1-inch radius circle to be drawn at the current position in red.
Rob Kinyon (email@example.com)