OpenDocument SVG Correspondence
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Section 9.2 (pp275-) of the OpenDocument specification (available at http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=office) is the most obviously related to SVG.
9.2.1 Rectangle
draw:rect element: svg:rect (http://www.w3.org/TR/SVG11/shapes.html#RectElement)
draw:corner-radius attribute: rx