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"I think children() is never a standard function although you wrote so in your article."
You're quite right. But remember this article is quite old. Both the XQuery language - and my understanding of it - have changed quite a bit. An update would be desirable, when/if I have time.
Specifically, children is a "data model" function used to describe the semantics of XQuery, but it isn't a user-accessible function.
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