Attributes and Namespaces with Batik's DOM implementation.

[Beton, Richard]

If I have a <desc> element, I should be able to set and get the 
xml:space attribute using

   String space = desc.getAttributeNS( XMLConstants.XML_NAMESPACE_URI, 
"space" );
and
   desc.setAttributeNS( XMLConstants.XML_NAMESPACE_URI, "space", 
"preserve" );

However, I'm getting some unexpected behaviour when I write my document 
to a file and read it back in.  Having set the xml:space attribute as 
above, the SVG document contains
   <desc space="preserve">blah</desc>
This is incorrect: the "xml:" namespace prefix is missing from the space 
attribute.

If instead I use the following incorrect code:
   desc.setAttributeNS( null, "xml:space", "preserve" );
then the output file is written correctly.
This odd behaviour seems to happen only with some namespaced-attributes, 
not all.  The two I've noticed are xml:space and xlink:href, and these 
show problems only intermittently.  Is this a bug in Batik's DOM?  (I'm 
using v1.5.1.)  Or have I omitted something?

I noticed there has been a related bug filed;
http://issues.apache.org/bugzilla/show_bug.cgi?id=20156
Regards,
Rick
Here's a more complete exceprt of my test code
   public void addContent ()
   {
       SVGOMDocument document = (SVGOMDocument) getDocument();
       Element svg = document.getDocumentElement();
       SVGDOMImplementation impl = (SVGDOMImplementation)
           SVGDOMImplementation.getDOMImplementation();
       Element defs = impl.createElementNS( document,
           SVGDOMImplementation.SVG_NAMESPACE_URI, 
SVGConstants.SVG_DEFS_TAG );
       defs.setAttributeNS( null, "id", "defs1" );
       svg.appendChild( defs );

       Element desc = impl.createElementNS( document,
           SVGDOMImplementation.SVG_NAMESPACE_URI, 
SVGConstants.SVG_DESC_TAG );
       GenericText t1 = new GenericText( "two line\ndescription", 
document );
       desc.appendChild( t1 );
       desc.setAttributeNS( null, "id", "desc1" );
       desc.setAttributeNS( XMLConstants.XML_NAMESPACE_URI, "space", 
"preserve" );
       svg.appendChild( desc );

       Element a = impl.createElementNS( document,
           SVGDOMImplementation.SVG_NAMESPACE_URI, 
SVGConstants.SVG_A_TAG );
       GenericText t2 = new GenericText( "hello", document );
       a.appendChild( t2 );
       a.setAttribute( "id", "a1" );
       a.setAttributeNS( XMLConstants.XLINK_NAMESPACE_URI, "href", 
"nowhere" );
       a.setAttributeNS( XMLConstants.XLINK_NAMESPACE_URI, "type", 
"simple" );
       svg.appendChild( a );
   }

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