[jdom-interest] Newbie Namespace question

[MarkW]

Hi,
how can i generate this:
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">

I tried
  public final static String FOROOT =
"\"http://www.w3.org/1999/XSL/Format\"";
  ....
  Namespace nsFO = Namespace.getNamespace( "fo" );
  fop = new Element( "root", nsFO );
  fop.setAttribute( "fo", FOROOT, Namespace.getNamespace( "xmlns" ) );

but get the error:
.....
org.jdom.IllegalNameException: The name "" is not legal for JDOM/XML
attribute n
amespaces: An attribute namespace without a prefix can only be the
NO_NAMESPACE
namespace.
TIA
Mark