I'm having problems producing an XML document with XML::Writer. the document looks something like...
<ROOT-NS:doctag xmlns:ROOT-NS="http://www.xxxx.com/yyy">
  <ROOT-NS:bodytag>
     <data xmlns="http://www.xxxx.com/zzz">
         <test>ok</test>
     </data>
  </ROOT-NS:bodytag>
</ROOT-NS:doctag>
Notice the data tag.
It has a namespace attribute with no name.
The Java guys I'm working with say that this is perfectly legal and it is called a default namespace.
When I try and use XML::Writer to do the same thing I always get __NS1 when I don't set a namespace name in my prefix map.

here is my prefix map...

$root_ns = "http://www.xxxx.com/yyy";
$data_ns = "http://www.xxxx.com/zzz";
$prefix_map = {
   $root_ns => 'ROOT-NS',
   $data_ns => ''
};

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This makes my data tag look like...
<__NS1:data xmlns:__NS1="http://www.xxxx.com/zzz">
    <test>ok<test>
<__NS1:data>

My XML document object is created with...
$xml = XML::Writer->new(DATA_MODE => 1, DATA_INDENT => 2, NAMESPACES =
+> 1, PREFIX_MAP => $prefix_map);

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... and the data tag section looks like...
$xml->startTag([[$data_ns, 'data']]);
$xml->dataElement('test', 'ok');
$xml->endTag();

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The perldocs for XML::Writer say...

"
The keys in the hash table are namespace URIs, and the values are the associated prefixes. If there is not a preferred prefix for the namespace URI in this hash, then the module will automatically generate prefixes of the form "__NS1", "__NS2", etc.

To set the default namespace, use '' for the prefix.
"

What am I doing wrong?

In reply to XML::Writer and the default namespace by mifflin

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