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As I have posted before, I have to maintain a script written XML::Twig to validate dictionary entries. In one part of the entry we can have <la> elements which are used to hold label information such as whether the word is rare or not. The test for rare is that the la element contains the text "rare".

I have now been asked to modify this so that the word is not treated as rare when the la element is marked with an attribute fq with a vlaue of 0 or 1. The fq attribute can also have a value of 2 in which case the word is still to be treated as rare.

My code so far looks like this:

sub is_la_rare { my $elt = shift; # can be <labels> or <def> foreach my $label ($elt->children('la') ) { next unless $label->text eq "rare"; my $isNowRare = 0; if ( ($label->att('fq') eq "0") || ($label->att('fq') eq "1") ) { $isNowRare = 1; } if ( !$isNowRare ) { return 1; } } return 0; }

The problem is that this generates "Use of uninitialized value in string eq" which I think is caused by the cases when the la element does not have an fq attribute on it. So I want to add a test for the attribute like this: ($label ->att('fq') && $label->att('fq') == "1"). The first bit returns the value of the attribute so it works when that is 1 but if I try to use where the attribute is "0" ($label ->att('fq') && $label->att('fq') == "0") it doesn't work because it then returns 0 for the first bit.

Is there a way of testing for the presence of an attribute in XML::Twig which would return "1" if the attribute is present regardless of the value of the attribute?

In reply to XML::Twig - how can I test for an attribute when the attribute value is 0? by mertserger

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