Marnen Laibow-Koser wrote in post #968931:
> Kefan X. wrote in post #968930:
>> I am trying to parse both rss feed and atom feed using Nokogiri.
>
> There's probably a library that does this already; if there is, you
> should use it if possible.  But read on for other ideas.
>
>> I'm
>> meeting a problem where i cannot use one query to universally select
>> both rss element and atom element.
>>
>> E.g.
>>
>> @item = "item"
>> root.xpath(//#...@item}) will select for rss
>> @item = "entry"
>> root.xpath(//#...@item}) will not select for atom
>>
>> Even though the entry tag has no explicit namespace attached to it. I
>> understand this is an implicit namespace issue which is in the xml
>> specifications. However, I am wondering if there's a way to circumvent
>> this issue to allow nokogiri to somehow modify the document so that the
>> xpath on implicitly namespaced element would work without a namespace.
>
> Do you want to use XSL or something (perhaps Ruby!) to transform RSS to
> Atom (or vice versa)?  Do I understand correctly?
>

Yes, I need to transform one format to another.

> If not, then I think this is an XPath question, and might be better
> directed to an XML forum.
>

This is not really an xpath question as the specs is in my opinion could 
use a different approach. It is a fundamental obstacle. Therefore I am 
asking whether or not there is a nokogiri workaround to solve this 
problem.

> Alternatively, you could detect whether the feed is RSS or Atom, then
> build the XPath expression accordingly.
>

Yea, this is the last scenario I want to approach but I agree it is the 
simplest method. Thanks a lot for your help though!

>> Thanks!
>
> Best,
> --
> Marnen Laibow-Koser
> http://www.marnen.org
> [email protected]

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