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[Bug 29982] [XSLT30] What is this Note, comparing tunnel params with variables in functional languages referring to?

From: <bugzilla@jessica.w3.org>
Date: Sun, 06 Nov 2016 13:19:20 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-29982-523-Xr1dz2pIqD@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=29982

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
I'm not an expert on this area. There's a brief account of dynamic scoping in
the Wikipedia article

https://en.wikipedia.org/wiki/Scope_(computer_science)#Dynamic_scoping

I think it is found in some dialects of Lisp, Scheme, Smalltalk.

The note was put there to answer the question "is there any precedent or
theoretical basis for the idea of tunnel parameters": it asserts that such a
precedent exists, without going into great technical detail to justify this.

I would be reluctant to remove the note, since I think it points the interested
reader in the right direction, and I would be reluctant to expand it, since (a)
I don't have the technical background to be sure of getting it right, and (b) I
don't think it's justified.

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