[Zope3-Users] Re: folder list in a vocabulary

[Michel Pelletier]

Duncan McGreggor wrote:
> 
> On Oct 19, 2005, at 12:35 PM, Michel Pelletier wrote:
> 
>>> Note that I would strongly suggest using a relationship framework for 
>>> this sort of use case. A good API is provided by 
>>> ``schooltool.relationship`` and is heavily used in the SchoolTool 
>>> code, so you have many examples.
>>
>>
>> For a similar relationship library that uses a faster indexing method, 
>> and supports multiple relationship store backends (ZODB, sleepycat, 
>> SQLObject, redland, cwm, 4Thought), supports W3C standard relationship 
>> interchange formats (RDF/XML, N3), and comes with a standard SQL -like 
>> query language (Sparql), see http://rdflib.net.  There is a Zope 3 
>> product called Zemantic at codespeak which defines the necessary ZCML 
>> to register rdflib classes with Zope 3.
> 
> 
> Michael, I've been dying to try this out, but I wanted to wait for z3.1 
> compat. I haven't seen anything on the maillist since July -- what's the 
> status?

The Zemantic trunk on codespeak is 3.1 compatible, and represents the 
latest version.  I should shore it up, add some docs, and make a new 
release.  I'm going on vacation next week, I'll see what I can do afer 
that.  After some good discussion with Gary Poster over on the dev list, 
I have a lot of ideas for the next version, but not a lot of time :( 
The new zemantic.org site has just been brought up, and I've had no time 
to add content.

What time I do have for Zemantic I have tried to put into rdflib 
instead, since it is the core library and a higher priority.

The current trunk version of Zemantic is a serious reduction in 
complexity from the previous versions.  For example, it does not come 
with an "example" content object anymore, because any Zope 3.1 content 
object that implements IZopeDublinCore and triggers an add object event 
can be used.

It also does not come with any ZMI interfaces (other than the simple 
add/remove utility stuff), since I'm just no good at UI and representing 
a 2 megatriple store in HTML is tricky, I also removed the Java applet 
visualization stuff because it was turgid and mostly useless (other than 
the gee-wiz factor).  Raphael Ritz had some really amazing ontology 
visualization in one of his projects.  I'd like to adopt something 
similar to that.

I am tentatively hosting an rdflib/Zemantic sprint in Portland Oregon, 
possibly in January.  The idea so far is that we would try and rent a 
ski cabin up on mt hood with high speed net and code all week and ski 
all weekend.  I'll make more annoucement about that as I get more 
commitment from others.  I think this might be a good thing for folks 
interested in RDF and Zope to attend.  Hopefully I can scratch up 10-12 
people.

This should be an interesting sprint, especially if some of the 
FourThought guys can come out.  I think Zope 2 has missed out on some 
synergy with them over the years, partly due to Zope 2's high cost of 
entry for other Python libraries.  I'd like to see what Zope 3 and FT 
stuff can do together.

Last, the FT, cwm, and rdflib developers have been doing some low-level 
talks on standardizing one RDF store interface that all the tools 
implement.  There is even the possibility that we will all settle on 
zope.interface and adaptation as the underlying compatibility mechanism. 
  Chimzie from FT and Dan from rdflib have been leading that, and there 
is more information on that at the new http://rdflib.net site.

-Michel