[xsl] Re: XSL-List Digest V4 #1736

Subject: [xsl] Re: XSL-List Digest V4 #1736
From: Eric Promislow <ericp@xxxxxxxxxxxxxxx>
Date: Mon, 20 Oct 2003 11:28:34 -0700
On Sun, 19 Oct 2003 07:47:23 +0100, "Michael Kay" <mhk@xxxxxxxxx> wrote:
> > A processor for a functional language may decide (and there 
> > are many cases when this happens) to perform lazy evaluation.
> > 
> > Among other things lazy evaluation means not to report an 
> > error, which does not actually affect the evaluation.
> This is one reason why in XSLT 2.0 we have distinguished very clearly
> between static errors and dynamic errors. If an error is defined as a
> static error then the processor must report it, even if the code is
> never executed. Referring to an undeclared variable is a static error in
> XSLT 2.0.

I would agree with this.  The time spent checking for unused
variables at compile-time is dwarfed by the convenience of
finding typos in variable names.  Good to hear that the 2.0 group
addressed this area.

- Eric

> However, I am surprised that any 1.0 processor should fail to report an
> error on the example submitted, where the reference to the undeclared
> (or out-of-scope) variable does actually appear to be evaluated.

And as you later stated, none of the three I tested did,  I just
didn't write it up as clearly as I could.

> Michael Kay

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