[jdom-interest] xmlns="" in children elements of root

Alex Rosen arosen at silverstream.com
Wed Aug 29 09:28:11 PDT 2001

> But, a "" namespace is illegal per w3c DOM.

The namespaces spec says:

“The default namespace can be set to the empty string. This has the same
effect, within the scope of the declaration, of there being no default

> I should NOT have to assign a namespace to every element.  I
> am creating XML
> files that must be validated against a Schema and the schema
> works as I
> stated, that all children are in the same namespace as the
> parent unless explicitly changed.

Don’t confuse a namespace with a namespace declaration. JDOM deals only with
namespaces. If you give each element a namespace, then this will result in
only one namespace declaration, at the root element. That sounds like it’s
what you want. (This is all in the FAQ.)

> So when I set the root element to xmlns="http://www.someplace.com"
> all it children are in that namespace, so for JDOM to add to
> the first level children an illegal namespace of "" this
> file is now invalid when I try to convert a JDOM
> document to a w3c DOM Document an exception is thrown stating
> that "" is illegal for a namespace.

That sounds like a bug. Which DOM implementation are you using (e.g. Xerces,
Crimson, etc)? Which verison? Can you send a stack trace? Maybe the
JDOM->DOM conversion code has a bug.


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