Re: Problem with "Turtle" output?

Andy Seaborne Tue, 22 Mar 2011 04:43:09 -0700

Fix applied to Jena CVS on SF.  test added.

It will print in abbreviated form the tail of the list is valid shortform (bnodes, only one rdf:rest, rdf:first per element), even if thehead isn't acceptable.


        Andy

On 22/03/11 10:26, Rob Vesse wrote:

Hi Frank

Interesting bug, have you considered publicising this more widely e.g. via
the [email protected] list since I suspect many other libraries may
encounter the same issue.

You could just provide the sample input as NTriples and then
developers/users can check whether their libraries have the issue and take
appropriate steps to get it fixed elsewhere.

I have already reproduced and fixed this issue in my own library's Turtle
Writer so I'll echo Andy's sentiment in saying thanks for a clear test case.
Took me only a minute to code up the equivalent in my library and confirm
the problem.

Rob

-----Original Message-----
From: Andy Seaborne [mailto:[email protected]]
Sent: 22 March 2011 08:22
To: [email protected]
Subject: Re: Problem with "Turtle" output?

  >  Is this a bug

Yes - I've raised JENA-55 with your example code as the test case.

Pretty printing Turtle requires a prepass over the data to find lists
that can't written prettily in the (...) form.  It should exclude lists
where one or more of the cons-cells making up the list has a URI.  This
is a very unusual case; it takes some effort to create a list not
comprised of blank node cons-cells (there are the Jena API operations
for lists).  In syntax, you have to write the list out long form - no
short form syntax enables this in Turtle).

Thanks, and thanks for a clear test case,

        Andy

https://issues.apache.org/jira/browse/JENA-55

On 21/03/11 22:08, Frank Budinsky wrote:



Hi,

I created an rdf:list with named list entries, but when I call

Model.write

("Turtle") it seems to ignore the names and generates the simple "(

... )"

list syntax. Here's a test program that illustrates the problem:

              Model model = ModelFactory.createDefaultModel();
              Resource data1 = model.createResource();

data1.addProperty(model.createProperty("http://property";),

"test1");
              Resource data2 = model.createResource();

data2.addProperty(model.createProperty("http://property";),

"test2");

              Resource listEntry1 =

model.createResource("http://test/1";);

              model.add(listEntry1, RDF.first, data1);
              model.add(listEntry1, RDF.rest, RDF.nil);

              Resource listEntry2 =

model.createResource("http://test/2";);

              model.add(listEntry2, RDF.first, data2);
              model.add(listEntry2, RDF.rest, listEntry1);

              Resource root = model.createResource("http://root";);
              root.addProperty(model.createProperty("http://list";),
listEntry2);

              model.write(System.out, "N-TRIPLE");
              model.write(System.out, "Turtle");

The output looks like this:

_:AX2dX96d4dd4X3aX12eda6ae213X3aXX2dX7fff<http://property>   "test1" .
<http://root>   <http://list>   <http://test/2>   .
<http://test/2>   <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest>
<http://test/1>   .
<http://test/2>   <http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
_:AX2dX96d4dd4X3aX12eda6ae213X3aXX2dX7ffe .
_:AX2dX96d4dd4X3aX12eda6ae213X3aXX2dX7ffe<http://property>   "test2" .
<http://test/1>   <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#nil>   .
<http://test/1>   <http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
_:AX2dX96d4dd4X3aX12eda6ae213X3aXX2dX7fff .
<http://root>
        <http://list>   ([<http://property>   "test2"
                  ] [<http://property>   "test1"
                  ]) .

The "N-TRIPLE" output is as expected, but the "Turtle" output has

discarded

the entry URIs.

Is this a bug?

Thanks,
Frank

Re: Problem with "Turtle" output?

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