[xsl] What is actually a "fragment" ?

Subject: [xsl] What is actually a "fragment" ?
From: Dimitre Novatchev <dnovatchev@xxxxxxxxx>
Date: Sat, 26 Apr 2014 12:03:04 -0700
 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

Dimitre Novatchev
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