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RE: Scope of uniqueness of generate-id()

Subject: RE: Scope of uniqueness of generate-id()
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Thu, 20 Nov 2008 17:05:41 -0000
RE:  Scope of uniqueness of generate-id()
> Until today I was thinking that xslt functions have no side 
> effects (provided extensions are not considered). 
> It has turned out that this is not correct.
> That changes the picture (at least for me).
> Many possible optimizations are not safe.

Yes, you will find this discussed in the XQuery formal semantics, I believe.

It's a very limited kind of side-effect - but it does have to be taken into
account by an optimizer.

Michael Kay

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