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Re: No bonus points for you :-)

by tobyink (Abbot)
on Mar 22, 2013 at 16:46 UTC ( #1024960=note: print w/replies, xml ) Need Help??

in reply to No bonus points for you :-)
in thread LibXML, XPath and Namespaces

"What I really wanted to achieve was for the system to assume the default namespace was 'gt' so I didn't have to include it in the prefix in all XPath expressions."

Well, that would break XPath spec compliance. As per the XPath spec, node names with no colon always reference nodes with no namespace at all.

Otherwise, if you could somehow set "gt" to be the default namespace for XPaths, you wouldn't be able to distinguish between the following two attributes:

<gt:foo gt:bar="1" bar="2" />

"It's fine when it's just one level deep e.g. EnvelopeVersion, but when you want to pick up a number of nodes 3 or 4 levels deep and keep having to repeat that 'gt:' at every level its a PITA."

I enjoy golf as much as the next man, but is three characters per name really so bad? (You could always bind the namespace to just "g" so it was two characters.) I saved you having to construct XML::LibXML::XPathContext objects, didn't I??

If your XPaths are fairly simple, you could take a look at XML::LibXML::QuerySelector which allows you to select nodes using CSS selectors. I wrote it for use with (X)HTML, but I don't see any reason it shouldn't roughly work with arbitrary XML.

package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name

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Re^2: No bonus points for you :-)
by space_monk (Chaplain) on Mar 25, 2013 at 10:07 UTC

    Everything you said is true, but the addition of this adds obscurity to the XPath selectors. Namespace confusion doesn't really exist as the entire document is written in the specified namespace.

    I suppose another dirty way is to strip the xmlns attribute from the document before parsing it... :-)

    Anyway my basic question has been answered in the negative, so I'm going to simply have to live with the "clean" way of doing it....

    A Monk aims to give answers to those who have none, and to learn from those who know more.

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