XML namespace confusion

[Anschel Schaffer-Cohen]

When using the encoding/xml package, I've come across a problem: the package will fill a struct member like "link" with a field like "aoeu:link", even though the two are in different namespaces. It's easy enough to specify a required namespace, but how do I specify that I want no namespace at all?

If that's not clear, here's some code that works (http://play.golang.org/p/e6GUdnbfRm) and here's some that doesn't because the <aoeu:link> field overwrites the <link> field (http://play.golang.org/p/m3Pg9ZZQHu).

Is there some simple way to get just the "link" field? I don't have the option to change the XML source.

[adnaan badr]

Hey,

         Change the Link field to []string type. http://play.golang.org/p/eomTG106q2. It will give you both values.

[Anschel Schaffer-Cohen]

That doesn't actually solve my problem, because there's no way for my program to know which value came from the <link> tag and which came from <xyz:link> tags.

[adnaan badr]

Ok.This might help: 

http://golang.org/src/pkg/encoding/xml/read_test.go#L503

[Anschel Schaffer-Cohen]

Unless I'm misunderstanding the example, that still doesn't work because I explicitly want those tags not in *any* namespace.

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Anschel

[Bob Hutchison]

Hi,

Assuming I understand your question...

Try this: http://play.golang.org/p/onODqrp0ig

You've got a couple of problems. First that's not well formed XML since the aoeu namespace prefix is undefined, you should define it -- Go is allowing the ill formed XML but it shouldn't. Second, you've not defined a default namespace, you don't have to but it's making things harder. You said you can't change the XML so I've shown one way to get around that by defining a default namespace outside of the XML file. In the code snippet there, I arbitrarily chose 'no-namespace' as the default namespace (this is *not* a namespace prefix, it's the namespace). To set it you have to get at the decoder, the call to Unmarshal is replaced with it's contents with the DefaultSpace set.

Hope that helps.

Cheers,

Bob

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[Anschel Schaffer-Cohen]

As it turns out, I'm using Google App Engine, which doesn't have DefaultSpace implemented. Maybe it's using an old version of Go?

[Nigel Tao]

On Fri, May 31, 2013 at 8:58 AM, Anschel Schaffer-Cohen
<ansc...@gmail.com> wrote:
> As it turns out, I'm using Google App Engine, which doesn't have
> DefaultSpace implemented. Maybe it's using an old version of Go?

DefaultSpace is new in Go 1.1. App Engine currently runs Go 1.0, but
App Engine Go 1.1 is in beta (you can try it now, see
https://groups.google.com/forum/?fromgroups#!topic/google-appengine-go/V1HMwZHbjZQ
for details) and should be launching soon. Watch
https://groups.google.com/forum/?fromgroups#!forum/google-appengine-go
for news.