Re: question about rules attributes...

>> Setting flag : "dont-build-content" AND attribute parent="tree" just 
>> don't draw anything ?
>> Removing parent="tree" allows to draw an empty container that is 
>> considered as a container... And is not, then the label disappear I 
>> don't know why.
>>
> 
> It should work.
> 

It doesn't in my case. In fact, this is a strange case : the container 
contains itself. This seems not to be really supported. In noticed other 
cases when opening a container that appears more than once in a tree 
often messes up the open states of the other instances... This seems 
normal if in the tree each instances uses the ressource uri as an ID. 
This should be fixed as, if the 2 resources are the same, the 2 views to 
them are two separate things ! I may have to display one or the other 
differently. I can show you when these cases are really important if you 
express concerns on this topic.

In this current case (with the disapearing label), the expandable icon 
(+) appears near the label... When I click on it to see content of this 
supposed-to-be container, it is found to be empty. Shortly after, the 
label disappear... ;)

I've broken the test case, but if this is of some interest for you, I 
can probably rebuild a simple case with an url to it.

Valentin