On 26/12/2011 06:48, Srimanth Gunturi wrote:
Hi Dave,
Is there any workaround for this problem (calling internal API)?
What problem? I thought we had agreed both outputs correctly represents
the RDF statements - which is the only guarantee the writer offers. They
are "just" syntactic variants of each other.
As noted in my response on Sourceforge you could always use the
non-ABBREV writer which will make things look more consistent -
consistently ugly maybe :) but more consistent.
You can also, as explained in the IO HOW TO [1], switch off particular
serialization rules. So you could switch off
RDFSyntax.sectionReification to avoid the syntactic short cut kicking
in, if that's the way round you want.
Note that the correct location for tracking jena issues and suggestions
is the Apache Jira [2].
Is there any other way to ID a statement with 'rdf:Id'?
Don't follow. In both your example outputs the statement is identified
by rdf:Id. In the first one it is done by the reification syntactic
short cut:
<dcterms:relation rdf:ID="relationship" rdf:resource="
http://localhost:8080/agent2";> ...
In the second one there is an explicit reification:
<rdf:Statement rdf:ID="relationship"> ...
Is there a reason you need to force one form over the other? As noted
above you could turn off the first form and so only get the second form
if that is helpful.
Dave
[1]
http://incubator.apache.org/jena/documentation/io/iohowto.html#advanced_rdfxml_output
[2]
http://incubator.apache.org/jena/help_and_support/bugs_and_suggestions.html
Regards,
Srimanth
On Sun, Dec 25, 2011 at 12:46 PM, Dave Reynolds
<[email protected] <mailto:[email protected]>> wrote:
On 25/12/2011 04:59, Srimanth Gunturi wrote:
Hi Dave,
Thanks for the response.
'prettyTypes' property did not help.
Oh well.
In turtle the model is identical.
Fine, so there is indeed no bug.
However the ordering of the statements
change.
The order is irrelevant.
I think this has some significance, as in
the com.hp.hpl.jena.xmloutput.__impl.Unparser when it tries to
figure out
which are the top level subjects - it comes up with different
outputs
based on the order in which it iterates the statements. This in-turn
happens due the different URL values passed in.
Yes, what Pretty Types is supposed to do is bias the choice of top
levels.
Dave
Regards,
Srimanth
==============================__==============
public class JenaReifiedProblem {
private static final String someBase = "http://someserver/myapp";;
public static void main(String[] args) {
generate1("http://localhost:__8080 <http://localhost:8080>");
System.out.println("---------"__);
generate1("http://localhost:__8080/app
<http://localhost:8080/app>");
System.out.println("---------"__);
}
public static void generate1(String serverURL) {
Model model = ModelFactory.__createDefaultModel();
model.setNsPrefix("dcterms", DCTerms.NS);
Resource agent = model.createResource(__serverURL+"/agent1",
DCTerms.Agent);
Resource fileFormat =
model.createResource("http://__formatsite.org/fileformat
<http://formatsite.org/fileformat>",
DCTerms.FileFormat);
fileFormat.addProperty(__DCTerms.title, "TXT");
agent.addProperty(DCTerms.__format, fileFormat);
agent.addProperty(DCTerms.__relation,
model.createResource(__serverURL+"/agent2"));
ReifiedStatement rs =
agent.getProperty(DCTerms.__relation).__createReifiedStatement(__someBase+"#relationship");
rs.addProperty(DCTerms.title, "My releationship");
model.getWriter("RDF/XML-__ABBREV").setProperty("__prettyTypes", new
Resource[]{DCTerms.Agent});
model.write(System.out, "RDF/XML-ABBREV", someBase);
//model.write(System.out, "N-TRIPLE", someBase);
}
}
==============================__===================
Turtle output:
==============================__===================
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#type
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#Statement
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>> .
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#object
<http://www.w3.org/1999/02/22-rdf-syntax-ns#object>>
<http://localhost:8080/agent2> .
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#predicate
<http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>>
<http://purl.org/dc/terms/__relation
<http://purl.org/dc/terms/relation>> .
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#subject
<http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>>
<http://localhost:8080/agent1> .
<http://localhost:8080/agent1>
<http://purl.org/dc/terms/__relation
<http://purl.org/dc/terms/relation>>
<http://localhost:8080/agent2> .
<http://localhost:8080/agent1>
<http://purl.org/dc/terms/__format
<http://purl.org/dc/terms/format>>
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>> .
<http://localhost:8080/agent1>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#type
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
<http://purl.org/dc/terms/__Agent
<http://purl.org/dc/terms/Agent>> .
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://purl.org/dc/terms/__title <http://purl.org/dc/terms/title>>
"My releationship" .
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>>
<http://purl.org/dc/terms/__title
<http://purl.org/dc/terms/title>> "TXT" .
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#type
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
<http://purl.org/dc/terms/__FileFormat
<http://purl.org/dc/terms/FileFormat>> .
---------
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#type
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#Statement
<http://www.w3.org/1999/02/22-rdf-syntax-ns#Statement>> .
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#object
<http://www.w3.org/1999/02/22-rdf-syntax-ns#object>>
<http://localhost:8080/app/__agent2
<http://localhost:8080/app/agent2>> .
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#predicate
<http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>>
<http://purl.org/dc/terms/__relation
<http://purl.org/dc/terms/relation>> .
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#subject
<http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>>
<http://localhost:8080/app/__agent1
<http://localhost:8080/app/agent1>> .
<http://someserver/myapp#__relationship
<http://someserver/myapp#relationship>>
<http://purl.org/dc/terms/__title <http://purl.org/dc/terms/title>>
"My releationship" .
<http://localhost:8080/app/__agent1
<http://localhost:8080/app/agent1>>
<http://purl.org/dc/terms/__relation
<http://purl.org/dc/terms/relation>>
<http://localhost:8080/app/__agent2
<http://localhost:8080/app/agent2>> .
<http://localhost:8080/app/__agent1
<http://localhost:8080/app/agent1>>
<http://purl.org/dc/terms/__format
<http://purl.org/dc/terms/format>>
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>> .
<http://localhost:8080/app/__agent1
<http://localhost:8080/app/agent1>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#type
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
<http://purl.org/dc/terms/__Agent
<http://purl.org/dc/terms/Agent>> .
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>>
<http://purl.org/dc/terms/__title
<http://purl.org/dc/terms/title>> "TXT" .
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#type
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
<http://purl.org/dc/terms/__FileFormat
<http://purl.org/dc/terms/FileFormat>> .
---------
==============================__===================
On Sat, Dec 24, 2011 at 8:24 AM, Dave Reynolds
<[email protected] <mailto:[email protected]>
<mailto:dave.e.reynolds@gmail.__com
<mailto:[email protected]>>> wrote:
On 23/12/2011 07:30, Srimanth Gunturi wrote:
Hello,
I have a model which contains a reified statement.
Depending on
what URLs I
use for resources, I get different outputs.
I would be thankful if someone could explain if this
behavior is
valid or a
bug.
Just looking at the outputs they both look correct. In the first
case the writer has chosen an order which allowed it to use the
"rdf:ID" shortcut on the reified statement, in the second case it
has used the full syntax.
The way to double check would be to convert both outputs to
Turtle,
which doesn't have a shortcut syntactic form for
reification, and
compare those outputs.
You can tune the serialization a little if you need to, for
example
setting to dcterms:Agent to be a "pretty type" would
encourage the
first form of output. See [1].
Dave
[1]
http://incubator.apache.org/____jena/documentation/io/iohowto.____html#advanced_rdfxml_output
<http://incubator.apache.org/__jena/documentation/io/iohowto.__html#advanced_rdfxml_output>
<http://incubator.apache.org/__jena/documentation/io/iohowto.__html#advanced_rdfxml_output
<http://incubator.apache.org/jena/documentation/io/iohowto.html#advanced_rdfxml_output>>
Thanks.
Sample code:
******************************____**************
public class JenaReifiedProblem {
private static final String someBase =
"http://someserver/myapp";;
public static void main(String[] args) {
generate1("http://localhost:____8080
<http://localhost:8080>");
System.out.println("---------"____);
generate1("http://localhost:____8080/app
<http://localhost:8080/app>");
System.out.println("---------"____);
}
public static void generate1(String serverURL) {
Model model = ModelFactory.____createDefaultModel();
model.setNsPrefix("dcterms", DCTerms.NS);
Resource agent =
model.createResource(____serverURL+"/agent1",
DCTerms.Agent);
Resource fileFormat =
model.createResource("http://____formatsite.org/fileformat
<http://formatsite.org/fileformat>
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>>",
DCTerms.FileFormat);
fileFormat.addProperty(____DCTerms.title, "TXT");
agent.addProperty(DCTerms.____format, fileFormat);
agent.addProperty(DCTerms.____relation,
model.createResource(____serverURL+"/agent2"));
ReifiedStatement rs =
agent.getProperty(DCTerms.____relation).____createReifiedStatement(____someBase+"#relationship");
rs.addProperty(DCTerms.title, "My releationship");
model.write(System.out, "RDF/XML-ABBREV", someBase);
}
}
******************************____**************
Output:
******************************____**************
<rdf:RDF
xmlns:dcterms="http://purl.____org/dc/terms/
<http://purl.org/dc/terms/>"
xmlns:rdf="http://www.w3.org/____1999/02/22-rdf-syntax-ns#
<http://www.w3.org/__1999/02/22-rdf-syntax-ns#>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#
<http://www.w3.org/1999/02/22-rdf-syntax-ns#>>">
<dcterms:Agent rdf:about="http://localhost:____8080/agent1
<http://localhost:8080/agent1>__">
<dcterms:relation rdf:ID="relationship" rdf:resource="
http://localhost:8080/agent2"/____>
<dcterms:format>
<dcterms:FileFormat
rdf:about="http://formatsite.____org/fileformat
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>>">
<dcterms:title>TXT</dcterms:____title>
</dcterms:FileFormat>
</dcterms:format>
</dcterms:Agent>
<rdf:Statement rdf:about="#relationship">
<dcterms:title>My releationship</dcterms:title>
</rdf:Statement>
</rdf:RDF>
---------
<rdf:RDF
xmlns:dcterms="http://purl.____org/dc/terms/
<http://purl.org/dc/terms/>"
xmlns:rdf="http://www.w3.org/____1999/02/22-rdf-syntax-ns#
<http://www.w3.org/__1999/02/22-rdf-syntax-ns#>
<http://www.w3.org/1999/02/22-__rdf-syntax-ns#
<http://www.w3.org/1999/02/22-rdf-syntax-ns#>>">
<dcterms:FileFormat
rdf:about="http://formatsite.____org/fileformat
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>>">
<dcterms:title>TXT</dcterms:____title>
</dcterms:FileFormat>
<rdf:Statement rdf:ID="relationship">
<rdf:subject>
<dcterms:Agent rdf:about="http://localhost:____8080/app/agent1
<http://localhost:8080/app/__agent1
<http://localhost:8080/app/agent1>>">
<dcterms:relation
rdf:resource="http://____localhost:8080/app/agent2
<http://localhost:8080/app/__agent2
<http://localhost:8080/app/agent2>>"/>
<dcterms:format
rdf:resource="http://__formats__ite.org/fileformat
<http://formatsite.org/fileformat>
<http://formatsite.org/__fileformat
<http://formatsite.org/fileformat>>"/>
</dcterms:Agent>
</rdf:subject>
<rdf:predicate
rdf:resource="http://purl.org/____dc/terms/relation
<http://purl.org/__dc/terms/relation>
<http://purl.org/dc/terms/__relation
<http://purl.org/dc/terms/relation>>"/>
<rdf:object rdf:resource="http://____localhost:8080/app/agent2
<http://localhost:8080/app/__agent2
<http://localhost:8080/app/agent2>>"/>
<dcterms:title>My releationship</dcterms:title>
</rdf:Statement>
</rdf:RDF>
---------
******************************____**************
