Non-standard elements in Atom

[Johnny Tolliver <to...@ornl.gov>]

Hi! I'm new to Abdera and the mailing list and have just one question.

I need to be able to build an Atom document that has some extra non- 
standard elements in it. For example, in addition to <title> and  
<subtitle> for a <feed>, I need to add a <summary> element. The name  
<summary> was chosen to match the <summary> that's available in an  
<entry>, but I need it at the <feed> level in addition to the entries.  
Similarly, I need a <subtitle> and a <published> in an <entry>.

Is that usage supported in Abdera? Perhaps in the extension mechanism?

Thanks,
Johnny Tolliver
tolliver@ornl.gov
865-574-1305

Re: Non-standard elements in Atom

[Bryon Jacob <br...@jacobtx.net>]

Johnny -

What you want to do is supported, but you will need to put the  
elements into a different namespace (since there is no <summary>  
element on a <feed> element in the http://www.w3.org/2005/Atom  
namespace)

Your XML will look something like:

<feed xmlns="http://www.w3.org/2005/Atom" xmlns:tolliver="http://johnny.tollivers.namespace.url 
">
    <title type="text">title goes here...</title>
    <tolliver:summary>Here's your Summary Element</tolliver:summary>
    <entry>
       ... you get the drift from here ...
    </entry>
</feed>


The Abdera API supports this nicely - you would do something like the  
above as follows:

    Feed feed = getMyFeedObjectSomehow();
    QName summaryQName = new QName("http://johnny.tollivers.namespace.url 
", "summary", "tolliver");
    feed.addSimpleExtension(summaryQName, "Here's your Summary  
Element");

if you needed a richer structure to an extension, Abdera supports  
that, too - but it's a bit more coding.

  - Bryon


On Feb 27, 2009, at 1:17 PM, Johnny Tolliver wrote:

> Hi! I'm new to Abdera and the mailing list and have just one question.
>
> I need to be able to build an Atom document that has some extra non- 
> standard elements in it. For example, in addition to <title> and  
> <subtitle> for a <feed>, I need to add a <summary> element. The name  
> <summary> was chosen to match the <summary> that's available in an  
> <entry>, but I need it at the <feed> level in addition to the  
> entries. Similarly, I need a <subtitle> and a <published> in an  
> <entry>.
>
> Is that usage supported in Abdera? Perhaps in the extension mechanism?
>
> Thanks,
> Johnny Tolliver
> tolliver@ornl.gov
> 865-574-1305
>

Re: Non-standard elements in Atom

[Charles Greer <ch...@oreilly.com>]

We've used the extension element feature extensively at O'Reilly. 
You'll find that it's trivial to add arbitrary extensions.  Naturally 
you'll have to wrangle with namespaces...  Wearing my RDF hat I'd 
suggest you use the Dublin Core

http://purl.org/dc/terms/issued for publication date and

our own

http://purl.oreilly.com/ns/meta/subtitle for subtitle

like this;

<entry xmlns="http://www.w3.org/2005/Atom" 
xmlns:dc="http://purl.org/dc/terms/"
xmlns:om="http://purl.oreilly.com/ns/meta/">
<title>My Big Fat Title</title>
...
<om:subtitle>A story about titles</om:subtitle>
<dc:issued>2004-06-22</dc:issued>
</entry>


Charles



Johnny Tolliver wrote:
> Hi! I'm new to Abdera and the mailing list and have just one question.
> 
> I need to be able to build an Atom document that has some extra 
> non-standard elements in it. For example, in addition to <title> and 
> <subtitle> for a <feed>, I need to add a <summary> element. The name 
> <summary> was chosen to match the <summary> that's available in an 
> <entry>, but I need it at the <feed> level in addition to the entries. 
> Similarly, I need a <subtitle> and a <published> in an <entry>.
> 
> Is that usage supported in Abdera? Perhaps in the extension mechanism?
> 
> Thanks,
> Johnny Tolliver
> tolliver@ornl.gov
> 865-574-1305
>