Removing xmlns="" from XmlTextWriter output

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Keith Hill - 07 Jan 2005 18:11 GMT

I am creating an XmlDocument in code and then using XmlTextWriter via
doc.WriteTo(xwriter) to output the result to a text box. I have a root
element that defines a default namespace. However, the sub-elements are
created without any namespaces like so:

XmlElement elem = doc.CreateElement("Foo");
root.AppendChild(elem);

but in the output I get this:

<?xml version="1.0" encoding="utf-8"?>
<Root xmlns="http://tempuri.org">
<Foo xmlns="" />
</Root>

How can I get rid of the ' xmlns="" ' attribute on the Foo element?

--
Keith

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Bjoern Hoehrmann - 07 Jan 2005 18:29 GMT

* Keith Hill wrote in microsoft.public.dotnet.xml:

>I am creating an XmlDocument in code and then using XmlTextWriter via
>doc.WriteTo(xwriter) to output the result to a text box. I have a root
[quoted text clipped - 10 lines]
> <Foo xmlns="" />
></Root>

If you call CreateElement without any namespace it creates an element
without any namespace. In XML, this is expressed via xmlns="". If you
want to have the Foo element in the same namespace as the Root element
you need to specify the namespace for CreateElement. Remember that

<Root xmlns="http://tempuri.org">
<Foo xmlns="http://tempuri.org" />
</Root>

is equivalent to

<Root xmlns="http://tempuri.org">
<Foo />
</Root>

For more information on XML namespaces try the various MSDN articles
and e.g.

* http://www.rpbourret.com/xml/NamespacesFAQ.htm
* http://www.jclark.com/xml/xmlns.htm

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Keith Hill - 07 Jan 2005 21:10 GMT

That works and thanks for the pointer to FAQ. That's good reading.

--
Keith

> If you call CreateElement without any namespace it creates an element
> without any namespace. In XML, this is expressed via xmlns="". If you
[quoted text clipped - 16 lines]
> * http://www.rpbourret.com/xml/NamespacesFAQ.htm
> * http://www.jclark.com/xml/xmlns.htm

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okie_greg - 23 May 2005 22:18 GMT

So that it is clear, in order to use a default namespace under the .Net
FX DOM, you have to specify the default? That is odd for a couple
reasons. First, a default can be defined as a value to use in the
absence of a provided value. This behavior of the DOM implementation
is changing that definition to if a particular value is supplied, we
will represent it as the default, yuck!. Second, in parent-child
entity relationships, it is the normal pattern for the child to take on
the attributes of it's parent unless specified as different (just like a
default, only oriented in objects hierarchies). Again, this behavior
changes that relationship, again, yuck!

--
okie_greg

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Removing xmlns="" from XmlTextWriter output

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