Re: [Tabulator] Re: Tabulator Firefox Extension Alpha


Thanks for checking this out. 

As you suggested, I asked my "friendly webmaster" Daniel Rubin, who is the 
director of National Center of Biomedical Ontology at Stanford.  His team 
has made a change according to your suggestion on their test server, check 
this ontology

I suggested to Daniel that as a requirement, BMO's server should serve all 
*.owl and *.rdf files as "application/rdf+xml".   Daniel's team could 
consider to make this a default behaviour for their production server. 

Do you see any potential problems in this requirement?

Best regards.


Tim Berners-Lee <> 
Sent by:
08/28/2007 05:13 PM

James D Hollenbach <jambo@MIT.EDU>, Semantic Web <>, 
Re: [Tabulator] Re: Tabulator Firefox Extension Alpha


The server must serve the file as an appropriate content type.  It is 
currently served as text/plain.  You can use the curl command on unix 
(including Mac) systems to test this.

$ curl -I 

HTTP/1.1 200 OK
Date: Tue, 28 Aug 2007 21:08:02 GMT
Server: Apache/2.0.54 (Debian GNU/Linux) mod_jk/1.2.14 PHP/4.3.10-22 
Last-Modified: Fri, 20 Jul 2007 00:00:28 GMT
ETag: "8540fe-1cd0ee-9d5fff00"
Accept-Ranges: bytes
Content-Length: 1888494
Content-Type: text/plain

The content type for OWL in rdf/xml should be application/rdf+xml
This can be set in the mime.types file in the apache config.
Ask your friendly webmaster.

(The online version of the tabulator will peek and see whether a plain 
text file looks like RDF
but the extension version can't do this or on would never be able to serve 
the source of an RDF document up for the user to look at)

Tim BL

On 2007-08 -28, at 17:06, wrote:

Dear James 

Being an user of ajar API, I immediately tested the Tabulator Firefox 
Extension.   Thanks for the good work. 

As a test, I tried to view the follow ontology from stanford's ontology 

But it only displayed as xml file in regular viewer.  However, when I put 
the same ontology on my local drive and use a local server (this local 
server is a semantic web server and has some content negotiation 
capability, for example on-fly conversion from n3 to rdf), the same 
ontology shows up in the tabulator viewer in firefox.   

I am wondering if there is any implied requirement on the server side in 
order to invoke the tabulator viewer? 

Kind regards. 


Helen Chen, Ph.D. 
Senior Researcher 
Advanced Clinical Applications 
455 Phillip Street, Waterloo, ON, Canada, N2L 3X2 
T: 519.746.2900 | 519.746.6210 x3186 
F: 519.746.3745 | C: 519.498.6244 

James D Hollenbach <jambo@MIT.EDU> 
Sent by:
08/28/2007 02:44 PM 

To, tabulator@csail.MIT.EDU 
Tabulator Firefox Extension Alpha


Today I am pleased to announce an alpha release of the Tabulator Firefox

Based on code from the original Tabulator web application, the Tabulator
Extension integrates the ability to browse linked data directly into 
After installing the extension, pages served as application/rdf+xml and 
will be automatically loaded into a Tabulator outline view for easy 
browsing.  A
single store contains all of the data found during a Firefox session, 
the data from all loaded documents together as you continue to browse.  
Queries can then be generated across the entire store in the same way as 
original Tabulator web application.

New in this version is the ability to directly edit files in real time 
the outline interface.  This feature is still largely in testing (it 
the user to enter values that should not be valid in many cases), but it 
is a
very powerful interface for quickly editing RDF.  A testing environment 
editing has been set up at .

Since the Tabulator Extension is still in its early stages, we would 
as much feedback as possible.  The issue tracker for the Tabulator project 
located at .  Also, a page for 
general discussion has been created on the ESW Wiki at .  Finally, feel free to send
questions directly to the Tabulator team at .


James Hollenbach / The Tabulator Team

Tabulator mailing list

Received on Wednesday, 29 August 2007 21:59:34 UTC