Get 'innerHtml' of SVG shape instance?

Hi,

I have an sgv document I'm rendering. Is it possible to get the text that
composes an sgv element via javascript? Something like:

   <svg>
       <rect id = "test" x="4" y="10" />
   </svg>

   <script>
       function f()
       {
           // I'd like the definition of rect "test" printed here.
           alert(document.getElementById("test").innerHTML);
       }
   </script>

I'd like to get the raw text that composes that shape element.

Thanks