Possible Values
<element x and y are coordinates for the circle center, and r
shape="circle" represents the radius
coords="x, y, r">
...</element>
<element x1 and y1 represent the top-left rectangle
shape="rectangle" corner, and x2 and y2 represent the bottom-
coords="x1, y1, x2, y2"> right corner
...</element>
<element each x and y pair represents the coordinates
shape="polygon" of a vertex in a polygon
coords="x1, y1, x2, y2, . . . xn, yn">
...</element>
The point of origin in the document is (0,0).
X increases toward the right and Y increases
toward the bottom.
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