Now, if I had a structure like this:
<root>
<SomeTag>This is the text</SomeTag>
<SomeTag>This is the text</SomeTag>
</root>
I'd have a duplicate.
No, when the spec speaks of duplicates it's generally talking about node
identity, not content. People sometimes use the phrase "two nodes with the
same identity" - I try to avoid that, because you've then got one node, not
two. A sequence contains duplicates if it contains the same node twice: for
example, with <root> in the above example as the context node, the sequence
(child::SomeTag, descendant::SomeTag) contains four items, namely two
occurrences of each of the two SomeTag nodes. If you replace the ","
operator with "|", duplicates are eliminated, and you end up with one
occurrence of each of the two SomeTag elements.
Michael Kay
http://www.saxonica.com/
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