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[xsl] What is actually a "fragment" ?

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 According to the XDM (both 2.0 and 3.0),

"[Definition: A tree whose root node is not a Document Node is
referred to as a fragment.]"

So a fragment is a tree.

However, I have been taught (by the books of Dr. Michael Kay) that an
fragment is a node-set, that by itself may not be a well-formed
document, but wrapping this node-set in a  single element parent will
make this a well-formed document.

There is an obvious contradiction in these two definitions -- in the
former a fragment must be a tree (have a root node), while in the
latter this isn't required.

So, which of the two definitions of a "fragment" should we use, and
how to make sure people understand which of the two definitions we are
using?

-- 
Cheers,
Dimitre Novatchev
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Truly great madness cannot be achieved without significant intelligence.
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To invent, you need a good imagination and a pile of junk
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Never fight an inanimate object
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To avoid situations in which you might make mistakes may be the
biggest mistake of all
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Quality means doing it right when no one is looking.
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You've achieved success in your field when you don't know whether what
you're doing is work or play
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To achieve the impossible dream, try going to sleep.
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Facts do not cease to exist because they are ignored.
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Typing monkeys will write all Shakespeare's works in 200yrs.Will they
write all patents, too? :)
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I finally figured out the only reason to be alive is to enjoy it.

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