They're differents things. Nodes are nodes in a tree, while items
are just items of a sequence. Nodes can be text(), element(), etc.
Not exactly, every value that matches node() also matches item() but
item() also includes atomic values. In Xpath2 nodes don't have to be in
a tree, if you go
<xsl:variable name="x" as="element()">
<x/>
</xsl:variable>
then $x is an element node that does not live in a tree (it has no
parent, and no children) some Xpath functions are restricted to elements
that _do_ live in a tree (defined as meaning that root() is an instance
of document-node()) but most operations on these parentless elements
work as you would expect (so long as you expect the right thing)
David
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