Hi Chris,

On 10/22/2009 03:25 AM, Chris Mitchell wrote:
> I like the ideas, but how hard would it be to add semantic annotations to
> the todo list?

I'm not sure I understand right what do you mean by semantic annotations, but 
if 
it's about automatically extracting information from wiki documents and 
labeling 
it with various metadata,
this is exactly what the Scribo project aims to do, which is using the 
annotation system I am discussing as a presentation and input method for those 
annotations. See http://www.scribo.ws for more information.

Thanks,
Anca

>
> Thanks in advance,
>
> Chris
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of
> Anca Luca
> Sent: Tuesday, October 20, 2009 10:12 AM
> To: XWiki Developers
> Subject: [xwiki-devs] [Discussion] Annotations improvements -- allowing
> different annotation types
>
> Hi devs,
>
> Following the previous mail with the desired improvements for the annotation
> feature, I would like to discuss some options for implementing the first of
> the enhancements, namely the ability to configure easily the type of added
> annotation. (see
> http://dev.xwiki.org/xwiki/bin/view/Design/AnnotationFeature#HFeaturesimprov
> ements
> for details).
>
> Two alternatives for this would be:
>
> A) to preserve the current architecture of the annotations plugin and only
> add a map of "extra fields" to the annotation type. The type of the
> annotation would be known by the js client through the configuration of an
> XWiki class and the js client would create a "generic" form for any such
> type.
> See more details about this solution at
> http://dev.xwiki.org/xwiki/bin/view/Design/AnnotationFeature#HSolution1extra
> fieldsintheAnnotationclass
> .
>
> Pros: preserves the current annotations architecture, creates an easy way to
> plug an annotation storage service
>
> Cons: the Annotation class would be nothing else but a "BaseCollection" the
> same as a generic XWiki object, and we would be reimplementing view, save,
> edit, delete of this type (already implemented through the xwiki action)
> from the web forms level (editing and displaying an annotation), through the
> controller (REST this time instead of actions in the standard wiki servlet),
> to the storage level (XWikiIOService will only transform a map (the
> Annotation class) to another map (the XWikiObject in the xwiki document)).
>
> B) to make an XWiki object model based implementation where the js client,
> to create the UI, would just asynchronously fetch standard actions in XWiki
> (edit, view, save). In this case, where all is handled exclusively through
> the XWiki model, Scribo would be plugged as an external service performing
> periodic updates between the XWiki instance and its RDF store.
>
> See more details about this solution at:
> http://dev.xwiki.org/xwiki/bin/view/Design/AnnotationFeature#HSolution2XWiki
> objectsmodelbasedimplementation
>
> Pros: uses the xwiki object model 100%, there's no reimplementing of the
> whole process of saving, editing objects, etc, the forms and views are light
> customizations of standard XWiki mechanisms
>
> Cons: the annotation mapping to document source cannot be implemented
> straightforward (there are changes needed in the architecture and
> algorithm), Scribo (or any other storage model different from XWiki) would
> need to duplicate data, and it would not be 100% real time (since it would
> be a periodical
> synchronizer)
>
> The current implementation is illustrated in the
> http://dev.xwiki.org/xwiki/bin/view/Design/AnnotationFeature#HCurrentImpleme
> ntation
> section.
>
> I like the elegance of the first solution more, for the way a different
> storage can be easily plugged, but I don't like that we're reimplementing a
> lot of XWiki objects manipulation (which is why 2 would be a better
> solution).
>
> WDYT?
>
> Thanks,
> Anca
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