missing Namespace declaration

[Tahura Chaudhry <ta...@hotmail.com>]

Hi,

I am attempting to creating an XML document and then serialize it into a 
Java string.  My code looks like:

Document doc= new org.apache.xerces.dom.DocumentImpl();
Element root = doc.createElementNS("http://www.foo.com", "ns1:data");

StringWriter stringOut = new StringWriter();
OutputFormat format  = new OutputFormat();
XMLSerializer serializer = new XMLSerializer(stringOut, format);
serializer.asDOMSerializer();

serializer.serialize(root);
String xmlstr = stringOut.toString();

When I print out the xmlstr , I see that the namespace declaration is 
missing. The prefix "ns1" is used but not declared. The XML printed is:

<?xml version="1.0" encoding="UTF-8"?>
<ns1:data/>

What do I need to do to get the namespace declaration to appear in the XML 
string.

thanks,
Tahura Chaudhry



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Re: missing Namespace declaration

[Stanimir Stamenkov <st...@myrealbox.com>]

/Tahura Chaudhry/:

> I am attempting to creating an XML document and then serialize it into a 
> Java string.  My code looks like:
> 
> Document doc= new org.apache.xerces.dom.DocumentImpl();
> Element root = doc.createElementNS("http://www.foo.com", "ns1:data");
...
> When I print out the xmlstr , I see that the namespace declaration is 
> missing. The prefix "ns1" is used but not declared. The XML printed is:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <ns1:data/>
> 
> What do I need to do to get the namespace declaration to appear in the 
> XML string.

You need to add it:

root.setAttribute("xmlns:ns1", "http://www.foo.com");

or may be:

root.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:ns1", 
"http://www.foo.com");

the later being useful only if you plan to manipulate the DOM 
furhter and you would rely on the namespaceURI property.

Here's what I read in the DOM Level 2 Core specification regarding 
"XML Namespaces" 
<http://www.w3.org/TR/DOM-Level-2-Core/core.html#Namespaces-Considerations>:

> As far as the DOM is concerned, special attributes used for 
> declaring XML namespaces are still exposed and can be manipulated 
> just like any other attribute. However, nodes are permanently bound 
> to namespace URIs as they get created. Consequently, moving a node 
> within a document, using the DOM, in no case results in a change of 
> its namespace prefix or namespace URI. Similarly, creating a node 
> with a namespace prefix and namespace URI, or changing the namespace 
> prefix of a node, does not result in any addition, removal, or 
> modification of any special attributes for declaring the appropriate 
> XML namespaces. Namespace validation is not enforced; the DOM 
> application is responsible. In particular, since the mapping between 
> prefixes and namespace URIs is not enforced, in general, the 
> resulting document cannot be serialized naively. For example, 
> applications may have to declare every namespace in use when 
> serializing a document.

-- 
Stanimir

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