reverse the cliping possibility

Would it be nice to reverse the cliping possibility in SVG that way, that
you don't cut off the outside of the clip path rather than the inside? Did I
overlook this possibility?
I'm able to manage it with some headstands like this:


<?xml version="1.0" standalone="yes"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20001102//EN" "svg-20001102.dtd">
<svg width="500" height="500">
 <defs>
<!-- To make the "inside" of a "clip path" invisible -->
 <g style="clip-rule:nonzero">
  <clipPath id="MyClip">
     <path d="M0,0 L500,0 500,500 0,500 z M200,200 L300,200 300,300 200,300
z" style="clip-rule:evenodd"/>
  </clipPath>
 </g>
 </defs>
 <path d="M200,200 L300,200 300,300 200,300 z" style="stroke:black;
stroke-width:1; fill:none"/>
 <!-- The next 2 path objects are going through the whole image but they are
invisible inside the none filled recangle -->
 <path d="M0,0 L500,500" style="clip-path:url(#MyClip); stroke:black;
stroke-width:2; "/>
 <path d="M0,500 L500,0" style="clip-path:url(#MyClip); stroke:black;
stroke-width:2; "/>
</svg>


This would have consequences also to the filling of areas (for example: not
inside of a rectangle with fill property but outside of this rectangle)


Lutz Spranger