Is xmlns=“” a valid xml namespace?

Question

Is \"empty\" a valid value for XML namespace? If yes what does it mean?

I have the following XML code but I\'m not sure to which namespace Field1 and

Answer 1

Yes, it is valid. Section 6.2 in the Namespaces in XML 1.0 Recommendation specifically says:

The attribute value in a default namespace declaration MAY be empty. This has the same effect, within the scope of the declaration, of there being no default namespace.

Quoted from comment:

It is legal, and this is the way to bring an element into the global namespace.