[jdom-interest] hashCode() and equals()

[bob mcwhirter]

> I think the namespace API might need to be revisited one more time. 
> I'm not convinced we need to split up Namespace and prefix into 
> separate classes. On the other hand, perhaps the Namespace class 
> doesn't need to be exposed? Could we plausibly make it package 
> private and just have a public API in Element which exposes the 
> various namespaces and namespace mappings as strings? If so, all the 
> issues about what to do with the equals() method would become moot. 
> We could do whatever we needed internally without worrying about 
> confusing developers.

I agree.  

My use-case is...

	What namespace-uri is mapped to a given prefix,
	within the context of a given element.

	f(element+prefix) == URI

If I can answer that question, I'm happy.

	-bob