listResources

What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

Chris Dollin

2016-11-10 15:35:38 UTC

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

Read the javadoc.
Or look at the source.

Chris

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A. Soroka

2016-11-10 15:35:00 UTC

https://jena.apache.org/documentation/javadoc/jena/org/apache/jena/rdf/model/Model.html#listResourcesWithProperty-org.apache.jena.rdf.model.Property-

Please learn to read Javadocs for software you are using.

---
A. Soroka
The University of Virginia Library

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

kumar rohit

2016-11-10 15:58:58 UTC

Thank you Chris and Soroka.

I have read this and could not understand it properly, that is why I asked
the question here. I will be happy if some one give an example with
model.listResourcesWithProperty()
used in it.

Post by A. Soroka
https://jena.apache.org/documentation/javadoc/jena/
org/apache/jena/rdf/model/Model.html#listResourcesWithProperty-org.
apache.jena.rdf.model.Property-
Please learn to read Javadocs for software you are using.
---
A. Soroka
The University of Virginia Library

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

Lorenz B.

2016-11-11 09:34:41 UTC

I assume that you know what resources and properties in RDF graphs are.

Given the property p, indeed one can check for all triples (s_i, p,
o_j), i.e. all triples that have the property p in predicate position.
The methods:

listResourcesWithProperty(Property p) returns all resources s_i

listResourcesWithProperty(Property p, RDFNode o) returns all subjects
s_i that occur in triples in which o_j matches o

Lorenz

Post by kumar rohit
Thank you Chris and Soroka.
I have read this and could not understand it properly, that is why I asked
the question here. I will be happy if some one give an example with
model.listResourcesWithProperty()
used in it.

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

--
Lorenz BÃŒhmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center

kumar rohit

2016-11-11 19:56:21 UTC

Thank you Lorenz.

I have *OntClass std = model.getOntClass(ns + "Student");*

for (Iterator i = model.listResourcesWithProperty(RDF.type, std);
i.hasNext();) {
model.listStatements(null,RDF.type, "Student");
System.out.println("Student: " + i.next());
}

I read this on the web, here why we use: *model.listStatements(null,RDF.type,
"Student");*

*Because we can get Subjects of the triple already from this
statement: *model.listResourcesWithProperty(RDF.type,
std);

On Fri, Nov 11, 2016 at 11:34 AM, Lorenz B. <

Post by Lorenz B.
I assume that you know what resources and properties in RDF graphs are.
Given the property p, indeed one can check for all triples (s_i, p,
o_j), i.e. all triples that have the property p in predicate position.
listResourcesWithProperty(Property p) returns all resources s_i
listResourcesWithProperty(Property p, RDFNode o) returns all subjects
s_i that occur in triples in which o_j matches o
Lorenz

Post by kumar rohit
Thank you Chris and Soroka.
I have read this and could not understand it properly, that is why I

asked

Post by kumar rohit
the question here. I will be happy if some one give an example with
model.listResourcesWithProperty()
used in it.

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

--
Lorenz BÃŒhmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center

Claude Warren

2016-11-12 14:15:42 UTC

Your statement

model.listResourcesWithProperty(RDF.type, std)

will list all the studen resources in the graph

the statement:

model.listStatements(null,RDF.type, "Student");

will probably list nothing given what I think you have in the graph as you
probably don't have any statements where the type is the literal "Student".

however:

model.listStatements(null,RDF.type, std);

would list all the statements (triples) that identify users.

In either case your example does not do anything with the result of the
listStatements() method call, and does not need it to print out the list of
students.

Claude

Post by kumar rohit
Thank you Lorenz.
I have *OntClass std = model.getOntClass(ns + "Student");*
for (Iterator i = model.listResourcesWithProperty(RDF.type, std);
i.hasNext();) {
model.listStatements(null,RDF.type, "Student");
System.out.println("Student: " + i.next());
}
I read this on the web, here why we use: *model.listStatements(null,
RDF.type,
"Student");*
*Because we can get Subjects of the triple already from this
statement: *model.listResourcesWithProperty(RDF.type,
std);
On Fri, Nov 11, 2016 at 11:34 AM, Lorenz B. <

Post by kumar rohit
Thank you Chris and Soroka.
I have read this and could not understand it properly, that is why I

asked

Post by kumar rohit
the question here. I will be happy if some one give an example with
model.listResourcesWithProperty()
used in it.

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

--
Lorenz BÃŒhmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center

--
I like: Like Like - The likeliest place on the web
<http://like-like.xenei.com>
LinkedIn: http://www.linkedin.com/in/claudewarren

kumar rohit

2016-11-12 15:14:45 UTC

So it means if we have to get instances of Student, both methods can be
used.?

Post by Claude Warren
Your statement
model.listResourcesWithProperty(RDF.type, std)
will list all the studen resources in the graph
model.listStatements(null,RDF.type, "Student");
will probably list nothing given what I think you have in the graph as you
probably don't have any statements where the type is the literal "Student".
model.listStatements(null,RDF.type, std);
would list all the statements (triples) that identify users.
In either case your example does not do anything with the result of the
listStatements() method call, and does not need it to print out the list of
students.
Claude

Post by kumar rohit
Thank you Chris and Soroka.
I have read this and could not understand it properly, that is why I

asked

Post by kumar rohit
the question here. I will be happy if some one give an example with
model.listResourcesWithProperty()
used in it.

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

--
Lorenz BÃŒhmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center

--
I like: Like Like - The likeliest place on the web
<http://like-like.xenei.com>
LinkedIn: http://www.linkedin.com/in/claudewarren

Claude Warren

2016-11-12 15:20:00 UTC

in short, yes.

Post by kumar rohit
So it means if we have to get instances of Student, both methods can be
used.?

you

Post by Claude Warren
probably don't have any statements where the type is the literal

"Student".

Post by Claude Warren
model.listStatements(null,RDF.type, std);
would list all the statements (triples) that identify users.
In either case your example does not do anything with the result of the
listStatements() method call, and does not need it to print out the list

Post by Claude Warren
students.
Claude

Post by Lorenz B.
I assume that you know what resources and properties in RDF graphs

are.

Post by Lorenz B.
Given the property p, indeed one can check for all triples (s_i, p,
o_j), i.e. all triples that have the property p in predicate

position.

Post by Lorenz B.
listResourcesWithProperty(Property p) returns all resources s_i
listResourcesWithProperty(Property p, RDFNode o) returns all

subjects

Post by Lorenz B.
s_i that occur in triples in which o_j matches o
Lorenz

Post by kumar rohit
Thank you Chris and Soroka.
I have read this and could not understand it properly, that is why

Post by Lorenz B.
asked

Post by kumar rohit
the question here. I will be happy if some one give an example with
model.listResourcesWithProperty()
used in it.

Post by A. Soroka
https://jena.apache.org/documentation/javadoc/jena/
org/apache/jena/rdf/model/Model.html#

listResourcesWithProperty-org.

Post by Lorenz B.

Post by A. Soroka
apache.jena.rdf.model.Property-
Please learn to read Javadocs for software you are using.
---
A. Soroka
The University of Virginia Library

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

--
Lorenz BÃŒhmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center

--
I like: Like Like - The likeliest place on the web
<http://like-like.xenei.com>
LinkedIn: http://www.linkedin.com/in/claudewarren

Lorenz B.

2016-11-12 14:52:23 UTC

Kumar,

Again, classes in RDF are identified by URIs, "Student" is not a URI!

And sure, there are several methods to achieve the same thing, which is
usually called convenience methods for things that are supposed to be
asked for quite often in an API.

Post by kumar rohit
System.out.println("Student: " + i.next());
}
I read this on the web, here why we use: *model.listStatements(null,RDF.type,
"Student");*
*Because we can get Subjects of the triple already from this
statement: *model.listResourcesWithProperty(RDF.type,
std);
On Fri, Nov 11, 2016 at 11:34 AM, Lorenz B. <

Post by kumar rohit
Thank you Chris and Soroka.
I have read this and could not understand it properly, that is why I

asked

Post by kumar rohit
the question here. I will be happy if some one give an example with
model.listResourcesWithProperty()
used in it.

Post by kumar rohit
What is mean my model.listResourcesWithProperty()?
What it accepts as parameters and what it returns as output?

--
Lorenz Bühmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center

Chris Dollin

2016-11-11 11:05:50 UTC