Re: About node references

> However, I have a few doubts about use cases myself. Let's look at 
creating
> a map. Conceptually we can model this  as a sequence of pairs, the pair
> being an atomic value (say) and a reference to an arbitrary sequence. 
The
> get() method is trivial: get($map, $key) -> item()*. The tricky bit is 
how
> to build the map. If we can define a functional relationship from the key 
to
> the value, then it's easy to define build-map($keys, $function). But 
that
> means the map can only do what a memo-function can do. Are there other 
cases
> for maps where the relationship isn't functional? I can't see how, in a
> stateless language. If all the relationships are functional, would we be
> better off with memo functions?

One can think of two map instances returning different values for the same 
keys.
This is similar to xslt key() function returning different values for the 
same key name, and 
value per different documents.

On the other hand the answer depends on what does $function mean 
(function-object reference)?
--
Vladimir Nesterovsky
http://www.nesterovsky-bros.com