Values for namespace in xmlns attribute

Question

I see the below document using 2 namespaces

**

  
    Apple         


        

Answer 1

The namespace URI is not used by the parser to look up information.

I think it should be sufficient for the URIs for the h and f namespaces you mentioned to simply be unique, valid URIs. In most examples, I've seen http used as the scheme name.

So, a perfectly valid namespace (that does not map to a valid website) could be:

xmlns:foo="http://my.example.ns"