You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@jena.apache.org by "Alexandre Bertails (Created) (JIRA)" <ji...@apache.org> on 2011/10/09 16:12:29 UTC
[jira] [Created] (JENA-132) N3 / TURTLE serializers ignore relative
URI
N3 / TURTLE serializers ignore relative URI
-------------------------------------------
Key: JENA-132
URL: https://issues.apache.org/jira/browse/JENA-132
Project: Jena
Issue Type: Bug
Components: Jena, RDF API
Reporter: Alexandre Bertails
Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
val turtle =
"""
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
<#JL>
a foaf:Person ;
foaf:homepage </2007/wiki/people/JoeLambda> ;
foaf:img <images/me.jpg> ;
foaf:name "Joe Lambda" .
"""
val base = "http://w3.org/People/Joe"
val model = {
val m = ModelFactory.createDefaultModel()
m.getReader("TURTLE").read(m, new StringReader(turtle), base)
m
}
model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (JENA-132) N3 / TURTLE serializers ignore
relative URI
Posted by "Andy Seaborne (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JENA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123751#comment-13123751 ]
Andy Seaborne commented on JENA-132:
------------------------------------
If I remember correctly because it needs finishing and testing.
Also, from memory, all the <#> stuff need removing because the base is not going to have a fragment if used with HTTP GET.
But it was a while ago.
> N3 / TURTLE serializers ignore relative URI
> -------------------------------------------
>
> Key: JENA-132
> URL: https://issues.apache.org/jira/browse/JENA-132
> Project: Jena
> Issue Type: Wish
> Components: Jena, RDF API
> Reporter: Alexandre Bertails
> Priority: Minor
>
> Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
> val turtle =
> """
> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> <#JL>
> a foaf:Person ;
> foaf:homepage </2007/wiki/people/JoeLambda> ;
> foaf:img <images/me.jpg> ;
> foaf:name "Joe Lambda" .
> """
> val base = "http://w3.org/People/Joe"
> val model = {
> val m = ModelFactory.createDefaultModel()
> m.getReader("TURTLE").read(m, new StringReader(turtle), base)
> m
> }
> model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
> model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (JENA-132) N3 / TURTLE serializers ignore
relative URI
Posted by "Andy Seaborne (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JENA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123693#comment-13123693 ]
Andy Seaborne commented on JENA-132:
------------------------------------
The output from the TTL writer is correct RDF - it just has not used the base URI to abbreviate the data. It's the same triples.
The output files from the TTL writer are a failthful representation of the triples and are fully portable (i.e. the RDF will be read the same where ever the file is read from). Some people would argue this is the better behaviour to the relative URIs generated by the RDF/XML-ABBREV writer.
A contribution to enable the writing of relative URIs by the TTL writer would be good.
Reclassified as a feature request.
> N3 / TURTLE serializers ignore relative URI
> -------------------------------------------
>
> Key: JENA-132
> URL: https://issues.apache.org/jira/browse/JENA-132
> Project: Jena
> Issue Type: Bug
> Components: Jena, RDF API
> Reporter: Alexandre Bertails
>
> Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
> val turtle =
> """
> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> <#JL>
> a foaf:Person ;
> foaf:homepage </2007/wiki/people/JoeLambda> ;
> foaf:img <images/me.jpg> ;
> foaf:name "Joe Lambda" .
> """
> val base = "http://w3.org/People/Joe"
> val model = {
> val m = ModelFactory.createDefaultModel()
> m.getReader("TURTLE").read(m, new StringReader(turtle), base)
> m
> }
> model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
> model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (JENA-132) N3 / TURTLE serializers ignore
relative URI
Posted by "Andy Seaborne (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JENA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123725#comment-13123725 ]
Andy Seaborne commented on JENA-132:
------------------------------------
Tim - this is not a bug. A bug would be where it does something wrong and the writer writes something that can't be parsed or isn't the RDF given as input.
The writer writes correct and legal Turtle for the test case given.
The relevant file is probably N3JenaWriterCommon and unused code controlled by doAbbreviatedBaseURIref. It needs enabling and testing, and test cases written.
I look forward to a contribution to Jena.
> N3 / TURTLE serializers ignore relative URI
> -------------------------------------------
>
> Key: JENA-132
> URL: https://issues.apache.org/jira/browse/JENA-132
> Project: Jena
> Issue Type: Wish
> Components: Jena, RDF API
> Reporter: Alexandre Bertails
> Priority: Minor
>
> Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
> val turtle =
> """
> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> <#JL>
> a foaf:Person ;
> foaf:homepage </2007/wiki/people/JoeLambda> ;
> foaf:img <images/me.jpg> ;
> foaf:name "Joe Lambda" .
> """
> val base = "http://w3.org/People/Joe"
> val model = {
> val m = ModelFactory.createDefaultModel()
> m.getReader("TURTLE").read(m, new StringReader(turtle), base)
> m
> }
> model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
> model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (JENA-132) N3 / TURTLE serializers ignore
relative URI
Posted by "Tim Berners-Lee (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JENA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123747#comment-13123747 ]
Tim Berners-Lee commented on JENA-132:
--------------------------------------
Thanks. I didn't find N3JenaWriterCommon but did find
http://jena.cvs.sourceforge.net/viewvc/jena/jena/src/com/hp/hpl/jena/n3/N3JenaWriter.java?revision=1.7&view=markup
hmm no doAbbreviatedBaseURIref though ... wrong repo? wrong branch?
In that file it looks like it is at
Line 652 return "<"+r.getURI()+">" ;
Where is thing hosted nowadays? Excuse my ignorance.
> N3 / TURTLE serializers ignore relative URI
> -------------------------------------------
>
> Key: JENA-132
> URL: https://issues.apache.org/jira/browse/JENA-132
> Project: Jena
> Issue Type: Wish
> Components: Jena, RDF API
> Reporter: Alexandre Bertails
> Priority: Minor
>
> Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
> val turtle =
> """
> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> <#JL>
> a foaf:Person ;
> foaf:homepage </2007/wiki/people/JoeLambda> ;
> foaf:img <images/me.jpg> ;
> foaf:name "Joe Lambda" .
> """
> val base = "http://w3.org/People/Joe"
> val model = {
> val m = ModelFactory.createDefaultModel()
> m.getReader("TURTLE").read(m, new StringReader(turtle), base)
> m
> }
> model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
> model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (JENA-132) N3 / TURTLE serializers ignore
relative URI
Posted by "Tim Berners-Lee (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JENA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123712#comment-13123712 ]
Tim Berners-Lee commented on JENA-132:
--------------------------------------
PLEA FOR RELATIVE URIs
Many systems, including most of the ones I have built and use day to day,
have many internal relative links but really are better
built without a knowledge of their own base URI, in that stored URIs
are always relative. Even if the software absolutizes them
in processing them, as there are no absolute URIs for the local identifiers
one can take a system such as a bug tracker and clone it easily to make
a new copy of the same system.
For example, issue tracking system, a calendar system, build with RDF
are interesting to clone.
This is not to say all systems are like this, but some are and they are an important
class.
For example one project I have a bunch RDF and rules, where there are
locally defined instances and local ontologies, and I process it
in file:// space much of the time, and browse it in http://
space though a web server, but when I edit it the http space
is actually proxies to a read-write-linked-data server on a different port.
With Jena serializes, suddenly the URI of the slave server behind the proxy
crops up in the files.
All the URIs within the system are relative.
Attempting to introduce Jena-based code to this system is currently blocked
on the need for this bug to be resolved in Jena.
For this reason, for example cwm's serializers use relative URIs, and even the
RDF/XML one has an option to put relative URIs in namespaces.
The rdflib.js library from Tabulator uses relative URIs by default.
Yes, yjere are cases when people want to design systems without this properties,
so absolute URIs should be an option.
Note other reasons for relative URIs include readability, and storage space and transmission length.
There is a classic failure mode for RDF systems in which
developers bring up a system on test.acme.com and then move it to production.acme.com
and everything breaking. I know there are cases for absolute URIs but the relative URIs are
very important best practices.
Tim
PS: This sort of RDF system is like writing program or set of programs
Imagine writing a program
pi = 3.14159265359;
print (2 * pi);
an it being saved in circles.py as
<file:///users/andys/programs/play/circles.py#pi> = 3.14159265359;
print (2 * <file:///users/andys/programs/play/circles.py#pi>);
Not practical, not the sort of thing you can copy and move around.
> N3 / TURTLE serializers ignore relative URI
> -------------------------------------------
>
> Key: JENA-132
> URL: https://issues.apache.org/jira/browse/JENA-132
> Project: Jena
> Issue Type: Wish
> Components: Jena, RDF API
> Reporter: Alexandre Bertails
> Priority: Minor
>
> Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
> val turtle =
> """
> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> <#JL>
> a foaf:Person ;
> foaf:homepage </2007/wiki/people/JoeLambda> ;
> foaf:img <images/me.jpg> ;
> foaf:name "Joe Lambda" .
> """
> val base = "http://w3.org/People/Joe"
> val model = {
> val m = ModelFactory.createDefaultModel()
> m.getReader("TURTLE").read(m, new StringReader(turtle), base)
> m
> }
> model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
> model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
Re: [jira] [Commented] (JENA-132) N3 / TURTLE serializers ignore
relative URI
Posted by Andy Seaborne <an...@apache.org>.
On 09/10/11 19:25, Paolo Castagna (Commented) (JIRA) wrote:
>
> [ https://issues.apache.org/jira/browse/JENA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123750#comment-13123750 ]
>
> Paolo Castagna commented on JENA-132:
> -------------------------------------
>
> Alexandre, the N3JenaWriterCommon.java file which Andy pointed you at is here:
> https://svn.apache.org/repos/asf/incubator/jena/Jena2/jena/trunk/src/main/java/com/hp/hpl/jena/n3/N3JenaWriterCommon.java
>
> Here is how you can check out Jena sources, run the tests and produce a patch:
>
> svn co https://svn.apache.org/repos/asf/incubator/jena/Jena2/jena/trunk/ jena
> cd jena
> mvn test
> ... here you make your changes (and add tests) ...
> mvn test
> svn diff> JENA-132.patch
>
> Use More Actions> Attach Files to attach the patch.
>
> I wonder why the functionality you want was there and it has always been commented code (since 2009).
If I remember correctly because it needs finishing and testing.
Also, from memory, all the <#> stuff need removing because the base is
not going to have a fragment if used with HTTP GET.
>
>> N3 / TURTLE serializers ignore relative URI
>> -------------------------------------------
>>
>> Key: JENA-132
>> URL: https://issues.apache.org/jira/browse/JENA-132
>> Project: Jena
>> Issue Type: Wish
>> Components: Jena, RDF API
>> Reporter: Alexandre Bertails
>> Priority: Minor
>>
>> Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
>> val turtle =
>> """
>> @prefix foaf:<http://xmlns.com/foaf/0.1/> .
>> @prefix rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
>> <#JL>
>> a foaf:Person ;
>> foaf:homepage</2007/wiki/people/JoeLambda> ;
>> foaf:img<images/me.jpg> ;
>> foaf:name "Joe Lambda" .
>> """
>> val base = "http://w3.org/People/Joe"
>> val model = {
>> val m = ModelFactory.createDefaultModel()
>> m.getReader("TURTLE").read(m, new StringReader(turtle), base)
>> m
>> }
>> model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
>> model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
>
> --
> This message is automatically generated by JIRA.
> If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
> For more information on JIRA, see: http://www.atlassian.com/software/jira
>
>
[jira] [Commented] (JENA-132) N3 / TURTLE serializers ignore
relative URI
Posted by "Paolo Castagna (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JENA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123750#comment-13123750 ]
Paolo Castagna commented on JENA-132:
-------------------------------------
Alexandre, the N3JenaWriterCommon.java file which Andy pointed you at is here:
https://svn.apache.org/repos/asf/incubator/jena/Jena2/jena/trunk/src/main/java/com/hp/hpl/jena/n3/N3JenaWriterCommon.java
Here is how you can check out Jena sources, run the tests and produce a patch:
svn co https://svn.apache.org/repos/asf/incubator/jena/Jena2/jena/trunk/ jena
cd jena
mvn test
... here you make your changes (and add tests) ...
mvn test
svn diff > JENA-132.patch
Use More Actions > Attach Files to attach the patch.
I wonder why the functionality you want was there and it has always been commented code (since 2009).
> N3 / TURTLE serializers ignore relative URI
> -------------------------------------------
>
> Key: JENA-132
> URL: https://issues.apache.org/jira/browse/JENA-132
> Project: Jena
> Issue Type: Wish
> Components: Jena, RDF API
> Reporter: Alexandre Bertails
> Priority: Minor
>
> Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
> val turtle =
> """
> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> <#JL>
> a foaf:Person ;
> foaf:homepage </2007/wiki/people/JoeLambda> ;
> foaf:img <images/me.jpg> ;
> foaf:name "Joe Lambda" .
> """
> val base = "http://w3.org/People/Joe"
> val model = {
> val m = ModelFactory.createDefaultModel()
> m.getReader("TURTLE").read(m, new StringReader(turtle), base)
> m
> }
> model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
> model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Updated] (JENA-132) N3 / TURTLE serializers ignore relative
URI
Posted by "Andy Seaborne (Updated) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/JENA-132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andy Seaborne updated JENA-132:
-------------------------------
Priority: Minor (was: Major)
Issue Type: Wish (was: Bug)
> N3 / TURTLE serializers ignore relative URI
> -------------------------------------------
>
> Key: JENA-132
> URL: https://issues.apache.org/jira/browse/JENA-132
> Project: Jena
> Issue Type: Wish
> Components: Jena, RDF API
> Reporter: Alexandre Bertails
> Priority: Minor
>
> Unlike RDF/XML* serializers, N3 and TURTLE ignore the base URI in their output.
> val turtle =
> """
> @prefix foaf: <http://xmlns.com/foaf/0.1/> .
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> <#JL>
> a foaf:Person ;
> foaf:homepage </2007/wiki/people/JoeLambda> ;
> foaf:img <images/me.jpg> ;
> foaf:name "Joe Lambda" .
> """
> val base = "http://w3.org/People/Joe"
> val model = {
> val m = ModelFactory.createDefaultModel()
> m.getReader("TURTLE").read(m, new StringReader(turtle), base)
> m
> }
> model.getWriter("TTL").write(model, System.out, base) // doesn't work as expected
> model.getWriter("RDF/XML-ABBREV").write(model, System.out, base) // this one is ok
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira