Writing GraphML with XOM?

I'm trying to write out a graphML document with XOM in java, but I can't figure out how to get all of the namespace declarations correct. To have valid graphML, I need to have a root element that looks like the following:

<graphml xmlns="http://graphml.graphdrawing.org/xmlns"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns
     http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">

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I've been able to get most of this by doing

Element root = new Element("graphml");
root.setNamespaceURI("http://graphml.graphdrawing.org/xmlns");
root.addNamespaceDeclaration("xsi", "http://www.w3.org/2001/XMLSchema-instance");

The problem is the last element of this tag, the xsi:schemaLocation. I can't figure out how to express this in XOM. I can't do it as a normal attribute, as that throws an exception(Attribute prefixes must be declared.) and doing it as an additional namespace declaration also results in an exception(NCNames cannot contain colons). Any ideas?

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This should do it. Basically you didn't provide the namespace URI for xsi:schemaLocation attribute. Thus trying to create a prefixed attribute with no namespace which clearly won't work.

root.addAttribute(new Attribute("xsi:schemaLocation",
    "http://www.w3.org/2001/XMLSchema-instance",
    "http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd"));

Check here for the correct Attribute constructor

Attribute(String name, String URI, String value)