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[xsl] Re: XSLT3.0: Predictable recovery of errors when rollback-output="no " is specified?


Subject: [xsl] Re: XSLT3.0: Predictable recovery of errors when rollback-output="no " is specified?
From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 25 Jan 2015 11:55:12 -0000

I agree with you, the suggestion of using xsl:variable is not fully worked
through and should probably be removed. All the examples I can think of would
be more easily handled by using a nested xsl:try/xsl:catch without the
rollback-output="no" option.

Michael Kay
Saxonica
mike@xxxxxxxxxxxx
+44 (0) 118 946 5893




On 24 Jan 2015, at 18:53, Dimitre Novatchev <dnovatchev@xxxxxxxxx> wrote:

> In section 8.3 "Recovery of Result Trees"  of the 2nd Last Call of the
> W3C XSLT 3.0 specification
> (http://www.w3.org/TR/2014/WD-xslt-30-20141002/#recovery), we read:
>
> "When rollback-output="no" is specified, it is still possible to
> ensure recovery of errors happens predictably by evaluating the
> potentially-failing code in temporary output state: typically, within
> an xsl:variable. In effect the variable acts as an explicit buffer for
> temporary results, which is only copied to the final output if
> evaluation succeeds."
>
> I feel rather confused by this statement. There is no example, backing
> it, provided and my attempts to construct such an example were not
> successful. I am beginning to think that the quoted statement above
> may not be true.
>
> In particular, how would one verify whether or not an error occurred
> (and was caught) when producing the result tree contained in a
> particular variable? Knowing this is needed in order to decide whether
> to output this variable to the final output or not.
>
> My question/request is for anyone to provide such an example.
>
> And the document will gain a lot by including such example in it.
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
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