Check type of node in XSL template

Question

Is it possible to check the type of a node I matched with a template inside the same template? In case it is, how can I do it? For example I would like to do something like

Answer 1

A more precise way to determine if the node $node is a root node:

not(count($node/ancestor::node()))

The expression in TimC's answer tests the type of the current node:

count(.|/)=1

but isn't applicable in the case when we want to determine the type of a node in a variable -- which may belong to another document -- not to the current document.

Also, a test for a namespace node:

count($node | $node/../namespace::*) = count($node/../namespace::*)