Find all namespace declarations in an XML document - xPath 1.0 vs xPath 2.0

Question

As part of a Java 6 application, I want to find all namespace declarations in an XML document, including any duplicates.

Edit: Per Martin\'s request, h

Answer 1

I think this will get all namespaces, without any duplicates:

for $i in 1 to count(//namespace::*) return 
if (empty(index-of((//namespace::*)[position() = (1 to ($i - 1))][name() = name((//namespace::*)[$i])], (//namespace::*)[$i]))) 
then (//namespace::*)[$i] 
else ()