Re: RDF Containers in XUL Trees

Neil Stansbury wrote:
> Hi Axel,
> 
> Thanks for this,
> 
>> You can use containment or whatever the attribute is actually called 
>> on the template to add arcs to iterate over. What you do is hardly 
>> going to do alot useful, though.
> 
> 
> No but it will allow me to test whether a resource has the property of 
> 'my:Container' rather than just the generic 'rdf:Seq'. It just seemed to 
> make more sense semantically.
> 
>> You could use plain containers, and use a instanceOf in the enum to 
>> add a new class. Or you go without it completely. Mixing rdf:li with 
>> other parents is likely to achieve brokeness.
> 
> 
> If I use the following RDF the tree doesn't build:
> 
> <my:Container rdf:about="level1" my:name="Parent">
>   <rdf:instanceOf
>       rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq"/>
>   <rdf:li rdf:resource="level2"/>
> </my:Container>
> 
> <my:Container rdf:about="level2" my:name="Child">
>   <rdf:instanceOf
>       rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq"/>
>   <rdf:li rdf:resource="level3"/>
> </my:Container>
> 
> If I swap the 'my:Container' class for 'rdf:Seq' it builds fine.
> 
> I take it this is what you mean by:
> 
>  > Mixing rdf:li with other parents is likely to achieve brokeness.
> 
> So in theory at least, how does the tree consider an assertion a container?

By standard means, it will assume that any arc of the form rdf:_1, 
rdf_2, etc is a containment arc. Those are generated automatically by 
rdf:li, but only in a RDF container environment. See your debugging 
(works this way, but not the other way around).

You can add other arcs by using the containment attribute on the 
template. 
http://xulplanet.com/references/elemref/ref_XULElement.html#attr_containment
> 
>> There is no such thing as a non-standard rdf container.
> 
> 
> As in rdf:Seq, rdf:Bag, rdf:Alt

Yes, those are the standard ones.

Axel