Re: [xsl] Fallback from document() error

[Miloslav Nic <nicmila@xxxxxxxxx>]

It is not.

I can have:

document('foo.xml')//aaa

with foo.xml:

<bbb/>

this bit will return empty node-set but I cannot 
find out that the document exists.

so 
1) I must have according to the current spec:
 a processor which returns empty set not an error if encounters
non-existing file (e.g. Saxon stops processing when the file does not
exist and it is right to do it according to the spec)

2) then I must test: document('foo.xml') and if this does not return
empty-nodeset then

3) I may use document('foo.xml')//aaa

In 1.1 I will not have problems with restrictions
on result tree fragment use, so I can reuse the part from case 2)
and it will not be necessary to repeat the document() part
but still I would love to have a possibility to distinguish
empty node-set because of non-existing file from empty node-set from
non-existing element in one step


David Carlisle wrote:
> 
> While a general exception handling mechanism would be interesting, is it
> clear why this particular case is an error at all what would be lost in
> mandating that document() returns an empty node set if it can't retrieve
> an XML file. This could be tested using standard boolean tests without
> need of error handler at all. Since this behaviour is already allowed by
> the spec it wouldn't be much of a change.
> 
> David
> 
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