Re: !=

> With lang tag awareness, the != operator can be overridden (because it's 
> an error) and, with lang tags, it is definitely known that @en and and 
> ^^xsd:integer are different values.  I tend to think of each language 
> tag inducing a independent value space.

Ah, thanks very much, Andy. I forgot to check for extensions in the test itself. Case closed!