Parsing Hyphenated xml Tag

can somebody explain me how to parse hyphenated xml tag using commons digest .i have been searching around the net but no luck help me out in this

<foo id="1">...
    <bar> 
      <foo-ref id="1"/> 
    </bar>
</foo>

Solution

What about this?

digester.addObjectCreate("foo-ref", "mypackage.FooRef");