RE: [xsl] handling failed document() invocations

[bibhaker.saran@xxxxxxxxxx]

Hi All,
Reading this thread, I understand that my problem is related, which was
posted as "xpath expression validity?"

How do I handle the failed document() or invalid XPath expression error?
I am using XSL only with MSXML4, Xercers-J (1.4.4 or others if recommended)
and XMLSpy v5

Thanks
Bibhakar Saran
_________________________
B2B Technical Architect
TXU IT Architecture & Planning
Level 15 452 Flinders St, Melbourne
Phone : (+61 3) 9229 6151
Mobile: 0411 203036
Email: bibhaker.saran@xxxxxxxxxx


                                                                                                                 
                    "Michael Kay"                                                                                
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>
> The problem is there may not be a document there, which is an
> OK state of affairs.  What is the xsl code idiom for
> detecting when document() is unable to find a document at the
> given location, and to handle this in a more meaningful way
> than exiting on error?
>
> If it matters I'm using saxon 6.5.2.
>

The XSLT 1.0 spec says that the implementation can choose whether to
fail when document() can't find anything, or to recover by returning an
empty node-set. Unfortunately this doesn't really help you write
portable code.

In Saxon you can set the error handling options from the command line:

  -w0 recovers silently from recoverable errors
  -w1 (the default) gives a warning and then recovers
  -w2 gives a fatal error

You can also control it from the API.

This is a global switch that applies to all errors; you could also try
to write a JAXP ErrorListener that handles the specific error.

Another approach is to write your own URIResolver that finds the
document, it can return a dummy document if nothing is found. This is
probably the most portable solution.

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx


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