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From "David Nuescheler" <david.nuesche...@gmail.com>
Subject Re: Suggestion on JSR 283.
Date Mon, 20 Feb 2006 11:50:00 GMT
Hi Chand,

Thanks for your email and thanks for the link to jlibrary.

First of all I would like to express my appreciation for all
the work done and I think it is fantastic to see applications
like jlibrary operate on JCR. This is precisely what JCR is
meant to be used for.

I think jlibrary also demonstrates in an impressive way
the need for some guidelines around "Content Modeling"
in general and "Nodetype Modelling" in particular.
So jlibrary may be a very good example to explain the
caveats, pro and cons, dos and don'ts around
nodetype modelling.

What do you think would be a good forum for an initial
set comments and dialog around the jlibrary content
model? Since Martin is also active on jackrabbit-dev
list, this may well be a good place to start the
discussions from which we then can harvest the best
practices around "content modelling".

With respect JSR-283, I would like to answer as a
member of the expert group (neither as the spec-lead
nor on behalf of the expert group).

In my mind JCR should still try to stay out of semantic
information modelling as much as possible. Having said that,
there are a few select areas where the benefit of interoperability
by "imposing" a given very well-known and established
data model outweigh the associated dangers and efforts.

Examples from JSR-170 are nt:file, nt:folder and nt:resource.

In JSR-283 I personally would expect few and very simple
nodetypes that describe very well-known, established and
frequently used concepts. Personally, I think of things
like a dublin-core or a "natural language" mixin.

Of course I am big believer in having a large number of
publicly known and well organized nodetypes, and any form
of complex media-types are perfect examples.

For an effort like that I would suggest a different platform
than the JCP that offers faster modification cycles and a
more open, less formalized and more collaborative environment.
Maybe the Jackrabbit project could host something like
a "Public Nodetype Library" initially?
[ http://zitting.name/jukka/2004/11/jackrabbit/msg00134.html ]


On 2/20/06, Chandresh Turakhia <chand.turakhia@bhartitelesoft.com> wrote:
> Dear David ,
> Jlibrary has done some nice work modelling nodes which basic applications need.
> http://jlibrary.sourceforge.net/6/hierarchy.html .JLibrary is Open Source DMS using Eclipse
RCP by Martin.
> Even exo has done some decent work - Creating standard services like templating based
on JSF+Velocity which most CMS need * use internally.Nice to have something that goes as standard
sample repositories. So that it facilitates easy integration of various CMS.
> JSR 283 Extract :
> - Improvement of content repository interoperability through the addition of new standardized
node types , including node types for meta information and internationalization
> Idea is to have standard nodes for DRM , MPEG 7 DDLs, MPEG 21 files.
> Standard property1 : AdaptableRenderer
>             property2 : AdaptablePersister
>            property3 : AdaptableQuery
> WORK DONE ON OUR SIDE : Most of these come as XSD files. Create Node for each and store
using XMLBeans or Hibernate 3 . Hibernate3 is ORXM tool. It is XML mapping tool too.
> Mr Leonardo from Chiarglione seems to be doing some great work in this area. (http://www.dmpf.org/).
> Idea is when standard node is getting processed, rendering engine ( may be OpenLazzlo)
checks for the property and uses it to create appropriate display. IDEA inspired by WSRP.
Data stored info as to how to render itself in Portal frameworks.
> And use Persister property to get best of RDBMS (e.g Oracle Intermedia features ). Depending
upon the content type ( Custom Node ) , different persistance mechanism can be usitilized.Joseph
from Oracle could be of good help.Exo Uses Hibernate and it can be this task easy. :)
> EXO uses hibernate , so I think it should be easy to do. Benjabin should be able to guide.
> Of the track, but Something really interesting from Dr. Peiya Liu of Siemens Research
to read
> http://www.idealliance.org/papers/xmle02/dx_xmle02/papers/03-02-01/03-02-01.html e.g.
MMDOC-QL for specifying MPEG-7 XML document queries. An example of query is in the form of
"finding all video object ids and show up time over a particular area".
> Basically somehow the idea goes against the principle of JSR 170 as I understand to NORMALIZE
the datastructure, to use the best features.
> Architecturally , When the XQuery based application finds the document of certain type,
application uses SubClassed Renderer,Query Engine.
> Regards
> Chand Turakhia
> -----Original Message-----
> From: David Nuescheler [mailto:david.nuescheler@gmail.com]
> Sent: Sunday, February 19, 2006 10:11 AM
> To: jackrabbit-dev@incubator.apache.org;
> chand.turakhia@bhartitelesoft.com
> Subject: Re: Copy of JSR 283.
> hi chand,
> > (Q1) Where can I get copy of JSR 283 ?
> jsr-283 is work in progress and there is no public copy available yet.
> anyway jackrabbit is based on jcr v1.0 as specified by jsr-170, which
> can be downloaded from the jcp site.
> > (Q2) Is there any best practice tutorial to "model"
> > application data/content using JCR.
> there are only public examples rather than actual best practices.
> personally i would greatly appreciate some effort in this direction
> maybe as part of the jackrabbit documentation.
> regards,
> david

http://jcr.day.com JCR in Action!
---------------------------------------< david.nuescheler@day.com >---

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David Nuescheler
Chief Technology Officer
Day Software AG
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