xpath find root child

[paulf]

doc.root.children.each { |child| puts child.name }
finds an import node
but
doc.xpath("//import")
does not find it
Should this form of xpath find it or how should it be used.
Or is there a problem with names without a prefix in a namespaced
document?

Thanks
Paul F Fraser

[Mike Dalessio]

Hi Paul,

You should check out the searching tutorial. We have a section on XPath and namespaces.

http://nokogiri.org/tutorials/searching_a_xml_html_document.html

Cheers,
-mike

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[Paul F Fraser]

Mike Dalessio wrote:
> Hi Paul,
>
> You should check out the searching tutorial. We have a section on
> XPath and namespaces.
>
> http://nokogiri.org/tutorials/searching_a_xml_html_document.html
>
> Cheers,
> -mike
>

Hi Mike,
http://gist.github.com/242324 has an example of problem.
Running ubuntu 9.04, jRuby 1.4
Any suggestions?
Paul

[Aaron Patterson]

Your document has xmlns default namespaces. Change your queries to
have 'xmlns' as the prefix and you should be OK:

//xmlns:annotation
//xmlns:import

You can read more info here:

http://nokogiri.org/tutorials/searching_a_xml_html_document.html

Specifically check out the namespaces section.

Hope that helps.

--
Aaron Patterson
http://tenderlovemaking.com/

[Mike Dalessio]

On Tue, Nov 24, 2009 at 6:16 PM, Paul F Fraser <pa...@a2zliving.com> wrote:

>

Hi Mike,
http://gist.github.com/242324 has an example of problem.
Running ubuntu 9.04, jRuby 1.4
Any suggestions?
Paul

The namespace usually needs to be included as part of the xpath query, so this will work:

puts doc.at_xpath("//xmlns:annotation", "xmlns" => "http://www.w3.org/2001/XMLSchema")
puts doc.at_xpath("//xmlns:import", "xmlns" => "http://www.w3.org/2001/XMLSchema")

Note that the prefix used in the query doesn't need to correlate to the namespace in the root node; only the URL does. So this also works:

puts doc.at_xpath("//foo:annotation", "foo" => "http://www.w3.org/2001/XMLSchema")
puts doc.at_xpath("//foo:import", "foo" => "http://www.w3.org/2001/XMLSchema")

But any namespaces declared on the root node are "included" automatically in an xpath search. So the shortest solution is this:

puts doc.at_xpath("//xmlns:annotation")
puts doc.at_xpath("//xmlns:import")

-m

[Paul F Fraser]

Thanks, Aaron & Mike,
For some reason the explanation in the tutorial on searching with
default namespaces did not 'click' with me for my case, but now very clear.
Regards
Paul