Re: querying multiple params

2009/7/24 Maurice Mengel <[email protected]>:
> Hi Petr,
>
> thanks for the quick answer!
>
> It is not that I didn't read these sentences, but I don't quite know what to
> do with it. I tried a lot of other queries  a long the way today and they
> worked as expected, e.g.
> //mpx:sammlungsobjekt[mpx:andereNr[@art = 'ID' and . = '$id'] and
> mpx:andereNr[@art ='DAT-Nr.' and . ]]
>
> Only the full one doesn't work:
> //mpx:sammlungsobjekt[mpx:andereNr[@art = 'ID' and . = '$id'] and
> mpx:andereNr[@art ='DAT-Nr.' and = '$tape_no']]
>
>
> That means only when I add the second variable, it doesn't work. That's why
> I assumed, I don't need to take the namespace issue into consideration.
> Anyways, it would be somewhat counter intuitive if the 2nd criterion breaks
> the namespace. At least, this is how it looks for me at the moment.
>
> I tried of course what you suggest. But I don't really get it either. I
> cannot find any example on the web easily. Special thanks therefore for the
> faq. I forgot about it. I am not sure I understand XPathContext. Anyways,
>
>         my $xpc = XML::LibXML::XPathContext->new;
>         $xpc->registerNs('mpx', 'http://www.mpx.org/mpx');
>         my $xpath ="//mpx:sammlungsobjekt[mpx:andereNr[\@art = 'ID' and . =
> '$id'] and mpx:andereNr[\@art ='DAT-Nr.' and . = '$tape_no']]";
>         my @nodes = $xpc->findnodes($xpath, $root);
>
> gives me exactly the same result (with and without the 2nd variable).
>
> Are you sure it is the namespace? Seems hard to believe...

Sorry, answering emails late at night was not a good idea. You are
right, if the namespaces were not registered, you would get an error.

So hard to tell, post a sample XML file and the values of the
interpolated variables.

-- Petr
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