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Color Specification Example
Illustrate how to specify colors in RVML using a simple circle. This example also
      highlights the effect of the opacity attribute. Colors are specified using standard SVG
      color names(e.g.'red'), SVG color constants (e.g. '#ff0000'), rgb tuples (e.g. 'rgb(
      255, 0, 0)'), or rgba tuples (e.g. 'rgba( 255, 0, 0, 255)').
            
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