I don't believe you:

use strict;
...
my $cve_id = 'CVE-2008-3763';
my $query = "/nvd/entry[@id = $cve_id]";

[download]

This code gives me:

Possible unintended interpolation of @id in string at tmp.pl line 3.
Global symbol "@id" requires explicit package name at tmp.pl line 3.
Execution of tmp.pl aborted due to compilation errors.

[download]

So you're either not using strict and warnings, or you're not posting the code you're running. Either way, I don't see how you expect us to help you, if you're not forthcoming about what you're actually doing.

In reply to Re: XPath query issue... by Corion
in thread XPath query issue... by spstansbury

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