Drop nonnormative mention of 'first quadrant coordinate system'

chapters/annotations.tex

@@ -375,8 +375,7 @@ \subsubsection{Coordinate Systems}\doublelabel{coordinate-systems}
 Each of the layers has its own coordinate system. A coordinate system is
 defined by the coordinates of two points, the left (x1) lower (y1)
 corner and the right (x2) upper (y2) corner, where the coordinates of
-the first point shall be less than the coordinates of the second point
-{[}\emph{a first quadrant coordinate system}{]}.
+the first point shall be less than the coordinates of the second point.
 
 The attribute \lstinline!preserveAspectRatio! specifies a hint for the shape of
 components of the class, but does not actually influence the rendering of the component.