Re: [Meinds-developers] RDF and Java

[Rickard <ri...@xp...>]

Erik Sundvall wrote:

> It will solve a particular, very important part of the Meinds 
> architecture. As we have discussed before I (and many others on the 
> list) believe we can find other already made components for most parts 
> of Meinds. A main task of the Meinds project will be to find good 
> components, glue them together (with as little extra code as possible) 
> and then package the whole thing in an attractive, user-friendly way.


I agree, although it also vital that it can be expanded with new code as 
easily as possible. I doubt that using Meinds in its "raw" form will be 
what most people want. Maybe a couple of "profiles" of Meinds will be 
more suitable. The key lies in customization though (IMHO).

What does people on this list want, or think about this?


> As I told you before (off list) you are very welcome to start developing 
> this within Meinds. The idea of then splitting it out to a separate 
> project is also a good idea. It can be dangerous to try to host too much 
> within a single project and the described concept is very general and 
> far from Meinds-specific. I believe most people on the list agree, and 
> as long as you keep the code Open Source (as you usually do).


Yup, so it'll begin as a part of Meinds then, and then be split off.


> To get up to speed I believe we can start using Jena for RDF 
> persistence. (It can be changed to something else later.) Jena provided 
> several different RDF storage options (XML-files, Memory based, Berkley 
> DB, SQL/JDBC (soon), Lucene (experimental). This does not exclude the 
> possibility to use JDO on different levels later.


That does indeed sound like a good gameplan.


> Where to perform and store access control to objects has been one of my 
> main concerns when thinking of Meinds architecture, now we can use RDF 
> for storage/persistence also of ACL data and "the interceptor-oriented 
> part" of Rickards idea for the actual access control checking.


Yes. As you have seen by now Erik, I already have ACL's and the 
accompanying ACLChecker interceptor working. It can be applied to any 
resource, so it's very very generic yet powerful.


> Well, it seems like we might have some interesting pieces for the Meinds 
> puzzle soon... time to assemble a first pre-alpha?

I'll do some more testing of the current codebase, but it should be 
sufficiently stable to try out now I think.

I'll send it to the list later.

/Rickard

-- 
Rickard Öberg