OK, I see the problem.
For me it's a bug, you can report it on our bugtracker if you want.

As a temporary  solution, you can use the right click -> Impoort XML schema.

That should help you to resolve this issue.

Regards,

Hi Shong,

thank you for directing me to this other post. Jonathan filed his problem as issue #0002339, which was solved:
http://talendforge.org/bugs/view.php?id=2339

Unfortunately, this does not solve my problem. I do not want to create xmlns attributes manually. Instead I want to specify the namespace "xml" for an attribute or entity:

It is okay to disallow the attribute "xmllang". The attribute "xml:lang" is perfectly valid though. The string "xml" is part of the namespace not part of the attribute name. But TOS does not allow me to create this.

Best regards,
Michael

Hi there,

I want to generate the following xml with a tAdvancedFileOutXML:

<?xml version="1.0" encoding="UTF-8"?>
<objects xmlns="http://www.example.com/xml/my_default_namespace">
  <object id="1234" xml:lang="de-DE">data</object>
</objects>

So I want to use a custom default namespace, but for some attributes I want to make explicit use of the "xml" namespace.

I tried to achieve this in TOS 3.0 and TOS 3.1, but I cannot enter a namespace that starts with xml. I always get the error message "Invalid string for XML Label. Label was not changed."

Best regards,
Michael