[development] Lineage module --- nested trees

[Dries Buytaert]

>> Well, killes commented in the issue that you will have problems  
>> with  multiple inheritance. I just pointed out that with  
>> hook_taxonomy you could  move this to a module. I was not thinking  
>> on other trees, but Dries is  quite right that there are many  
>> single inheritance trees in Drupal (we  talked a lot about them)  
>> AND many taxonomies are not multi inheritance --  they could  
>> benefit from this, too.
>> I hope this clarifies what's happened so far.
>
> I think it was the right path, too. What Dries wants out of this --  
> and I had not even thought about -- is a generic algorithm that can  
> be used for any tree. It makes a lot of sense, but I was only  
> focused on taxonomy because of what I was doing.
>
> A little bit of contemplation is showing me that some thought is  
> going to have to go into the design. I will post a draft on the  
> forum later today for feedback. There's a couple of different ways  
> to do this and I want to present them both (or all if I think of a  
> third) and see what people think.

Thanks Earl.  I hope it is possible to come up with a generic  
implementation that is elegant; it could significantly speed up the  
book module.

Looking forward to your designs,

--
Dries Buytaert  ::  http://www.buytaert.net/