Apache Jena reasoner with python

[Rocco Lillo]

I use apache jena fuseki as server sparqlendpoint interface for execute
query sparql on an ontology OWL that is loaded on server apache jena. The
queries are executed through python languages.
I have need that the results of query must be the consequence of process
the reasoning.
How I do at configure the reasoner with apache jena fuseki?
I use library sparqlwrapper for SPARQL Endpoint interface to Python.
# defines the URI of the endpoint and the query to send
uri = "http://localhost:3030/Hotel/query" <http://localhost:3030/Hotel/query>
query = ("PREFIX : <http://www.semanticweb.org/ontologies/Hotel.owl#> <http://www.semanticweb.org/ontologies/Hotel.owl#> "
"SELECT ?hotel ?price WHERE {"
" ?hotel a :Hotel. "
" ?hotel :hasPrice ?price }")
# obtain a connection to the endpoint and sends the query
sparql = SPARQLEndpointInterface(uri)
rs,fields = converter(sparql(query))
'''
This function sends the query to the SPARQL end-point.
statement: query in string form to send.
resultset: the result-set list in JSON format.
'''
resultset = []
self._sparql.setQuery(statement)
self._sparql.setReturnFormat(JSON)
print("SPARQLInterface is executing the query...")
t0 = time()
rs = self._sparql.query()
tf = time()
resultset = rs.convert()
print("Query has been executed successfully!\nTime elapsed: {0:.3f} seconds.".format(tf-t0))
raise Exception("")
self._sparql.resetQuery()
return resultset

[Andy Seaborne]

Hi Rocco,

To put in an inferencing dataset, you'll need to write a configuration
file. The UI can't create complex dataset setups.

Put the service and dataset description in the configuration/ directory
of the Fuseki area.

https://github.com/apache/jena/tree/master/jena-fuseki2/examples

-----------------

# Dataset with only the default graph.
<#dataset> rdf:type ja:RDFDataset ;
ja:defaultGraph <#model_inf> ;
.

# The inference model
<#model_inf> a ja:InfModel ;
ja:baseModel <#baseModel> ;
ja:reasoner [
ja:reasonerURL <http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>
] .

# The base data.
<#baseModel> a ja:MemoryModel ;
ja:content [ja:externalContent <file:Data/data.ttl> ] ;
.

-----------------

Andy

I use apache jena fuseki as server sparqlendpoint interface for execute
query sparql on an ontology OWL that is loaded on server apache jena. The
queries are executed through python languages.
I have need that the results of query must be the consequence of process
the reasoning.
How I do at configure the reasoner with apache jena fuseki?
I use library sparqlwrapper for SPARQL Endpoint interface to Python.
# defines the URI of the endpoint and the query to send
uri = "http://localhost:3030/Hotel/query" <http://localhost:3030/Hotel/query>
query = ("PREFIX : <http://www.semanticweb.org/ontologies/Hotel.owl#> <http://www.semanticweb.org/ontologies/Hotel.owl#> "
"SELECT ?hotel ?price WHERE {"
" ?hotel a :Hotel. "
" ?hotel :hasPrice ?price }")
# obtain a connection to the endpoint and sends the query
sparql = SPARQLEndpointInterface(uri)
rs,fields = converter(sparql(query))
'''
This function sends the query to the SPARQL end-point.
statement: query in string form to send.
resultset: the result-set list in JSON format.
'''
resultset = []
self._sparql.setQuery(statement)
self._sparql.setReturnFormat(JSON)
print("SPARQLInterface is executing the query...")
t0 = time()
rs = self._sparql.query()
tf = time()
resultset = rs.convert()
print("Query has been executed successfully!\nTime elapsed: {0:.3f} seconds.".format(tf-t0))
raise Exception("")
self._sparql.resetQuery()
return resultset

[Rocco]

Hi Andy,

I have put in the configuration file (config.ttl) the exactly code that
you have sent me that present in this
page(https://github.com/apache/jena/blob/master/jena-fuseki2/examples/service-inference-1.ttl)
but the result of query are not changed.

What is the problem?

Thanks in adavanced.

Rocco

Post by Andy Seaborne
Hi Rocco,
To put in an inferencing dataset, you'll need to write a configuration
file. The UI can't create complex dataset setups.
Put the service and dataset description in the configuration/
directory of the Fuseki area.
https://github.com/apache/jena/tree/master/jena-fuseki2/examples
-----------------
# Dataset with only the default graph.
<#dataset> rdf:type ja:RDFDataset ;
ja:defaultGraph <#model_inf> ;
.
# The inference model
<#model_inf> a ja:InfModel ;
ja:baseModel <#baseModel> ;
ja:reasoner [
ja:reasonerURL <http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>
] .
# The base data.
<#baseModel> a ja:MemoryModel ;
ja:content [ja:externalContent <file:Data/data.ttl> ] ;
.
-----------------
Andy

I use apache jena fuseki as server sparqlendpoint interface for execute
query sparql on an ontology OWL that is loaded on server apache jena. The
queries are executed through python languages.
I have need that the results of query must be the consequence of process
the reasoning.
How I do at configure the reasoner with apache jena fuseki?
I use library sparqlwrapper for SPARQL Endpoint interface to Python.
# defines the URI of the endpoint and the query to send
uri = "http://localhost:3030/Hotel/query"
<http://localhost:3030/Hotel/query>
<http://www.semanticweb.org/ontologies/Hotel.owl#>
<http://www.semanticweb.org/ontologies/Hotel.owl#> "
"SELECT ?hotel ?price WHERE {"
" ?hotel a :Hotel. "
" ?hotel :hasPrice ?price }")
# obtain a connection to the endpoint and sends the query
sparql = SPARQLEndpointInterface(uri)
rs,fields = converter(sparql(query))
'''
This function sends the query to the SPARQL end-point.
statement: query in string form to send.
resultset: the result-set list in JSON format.
'''
resultset = []
self._sparql.setQuery(statement)
self._sparql.setReturnFormat(JSON)
print("SPARQLInterface is executing the query...")
t0 = time()
rs = self._sparql.query()
tf = time()
resultset = rs.convert()
{0:.3f} seconds.".format(tf-t0))
raise Exception("")
self._sparql.resetQuery()
return resultset

[Andy Seaborne]

Rocco,

Post by Rocco
Hi Andy,
I have put in the configuration file (config.ttl) the exactly code that
you have sent me that present in this
page(https://github.com/apache/jena/blob/master/jena-fuseki2/examples/service-inference-1.ttl)
but the result of query are not changed.

Exactly? That is an example and you'll need to

For example, your data service is "Hotel/query" so the fuseki:name is
"Hotel" not "inf-mem". Maybe you want a different reasoner.

Post by Rocco
What is the problem?

What sort of reasoning are you expecting?

What does the instance data and the ontology look like?

Andy

Post by Rocco
Thanks in adavanced.
Rocco

Post by Andy Seaborne
Hi Rocco,
To put in an inferencing dataset, you'll need to write a configuration
file. The UI can't create complex dataset setups.
Put the service and dataset description in the configuration/
directory of the Fuseki area.
https://github.com/apache/jena/tree/master/jena-fuseki2/examples
-----------------
# Dataset with only the default graph.
<#dataset> rdf:type ja:RDFDataset ;
ja:defaultGraph <#model_inf> ;
.
# The inference model
<#model_inf> a ja:InfModel ;
ja:baseModel <#baseModel> ;
ja:reasoner [
ja:reasonerURL <http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>
] .
# The base data.
<#baseModel> a ja:MemoryModel ;
ja:content [ja:externalContent <file:Data/data.ttl> ] ;
.
-----------------
Andy

I use apache jena fuseki as server sparqlendpoint interface for execute
query sparql on an ontology OWL that is loaded on server apache jena. The
queries are executed through python languages.
I have need that the results of query must be the consequence of process
the reasoning.
How I do at configure the reasoner with apache jena fuseki?
I use library sparqlwrapper for SPARQL Endpoint interface to Python.
# defines the URI of the endpoint and the query to send
uri = "http://localhost:3030/Hotel/query"
<http://localhost:3030/Hotel/query>
<http://www.semanticweb.org/ontologies/Hotel.owl#>
<http://www.semanticweb.org/ontologies/Hotel.owl#> "
"SELECT ?hotel ?price WHERE {"
" ?hotel a :Hotel. "
" ?hotel :hasPrice ?price }")
# obtain a connection to the endpoint and sends the query
sparql = SPARQLEndpointInterface(uri)
rs,fields = converter(sparql(query))
'''
This function sends the query to the SPARQL end-point.
statement: query in string form to send.
resultset: the result-set list in JSON format.
'''
resultset = []
self._sparql.setQuery(statement)
self._sparql.setReturnFormat(JSON)
print("SPARQLInterface is executing the query...")
t0 = time()
rs = self._sparql.query()
tf = time()
resultset = rs.convert()
{0:.3f} seconds.".format(tf-t0))
raise Exception("")
self._sparql.resetQuery()
return resultset

[Rocco]

Hi andy,

I don't understand what are the configuration files to be edited.

I have the Hotel.ttl file in configuration/ directory and this is his
content:
@prefix : <http://base/#> .
@prefix tdb: <http://jena.hpl.hp.com/2008/tdb#> . @prefix rdf:
<http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix ja:
<http://jena.hpl.hp.com/2005/11/Assembler#> . @prefix rdfs:
<http://www.w3.org/2000/01/rdf-schema#> . @prefix fuseki:
<http://jena.apache.org/fuseki#> . :service_tdb_all a fuseki:Service ;
rdfs:label "TDB Hotel" ; fuseki:dataset :tdb_dataset_readwrite ;
fuseki:name "Hotel" ; fuseki:serviceQuery "query" , "sparql" ;
fuseki:serviceReadGraphStore "get" ; fuseki:serviceReadWriteGraphStore
"data" ; fuseki:serviceUpdate "update" ; fuseki:serviceUpload "upload" .
:tdb_dataset_readwrite a tdb:DatasetTDB ; tdb:location
"C:\\Users\\Maiullari\\Desktop\\TESI\\Software\\apache-jena-fuseki-2.3.0\\run/databases/Hotel"
. and also I have the config.ttl file in run/ directory and this is his
content: # Licensed under the terms of
http://www.apache.org/licenses/LICENSE-2.0 ## Fuseki Server
configuration file. @prefix : <#> . @prefix fuseki:
<http://jena.apache.org/fuseki#> . @prefix rdf:
<http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs:
<http://www.w3.org/2000/01/rdf-schema#> . @prefix ja:
<http://jena.hpl.hp.com/2005/11/Assembler#> . [] rdf:type fuseki:Server
; # Example:: # Server-wide query timeout. # # Timeout - server-wide
default: milliseconds. # Format 1: "1000" -- 1 second timeout # Format
2: "10000,60000" -- 10s timeout to first result, # then 60s timeout for
the rest of query. # # See javadoc for ARQ.queryTimeout for details. #
This can also be set on a per dataset basis in the dataset assembler. #
# ja:context [ ja:cxtName "arq:queryTimeout" ; ja:cxtValue "30000" ] ; #
Add any custom classes you want to load. # Must have a "public static
void init()" method. # ja:loadClass "your.code.Class" ; # End triples. .
Now, which file I have to edit between hotel.ttl and config.ttl? Can you
also tell me what are the values to be inserted in my case? Thanks in
adavanced.

Hi Andy, I have put in the configuration file (config.ttl) the
exactly code that you have sent me that present in this
page(https://github.com/apache/jena/blob/master/jena-fuseki2/examples/service-inference-1.ttl)
but the result of query are not changed.

Exactly? That is an example and you'll need to For example, your data
service is "Hotel/query" so the fuseki:name is "Hotel" not
"inf-mem". Maybe you want a different reasoner.

What is the problem?

What sort of reasoning are you expecting? What does the instance data
and the ontology look like? Andy

Thanks in adavanced. Rocco Il 18/11/2015 12:12, Andy Seaborne ha

Hi Rocco, To put in an inferencing dataset, you'll need to write a
configuration file. The UI can't create complex dataset setups. Put
the service and dataset description in the configuration/ directory
of the Fuseki area.
https://github.com/apache/jena/tree/master/jena-fuseki2/examples
----------------- # Dataset with only the default graph. <#dataset>
rdf:type ja:RDFDataset ; ja:defaultGraph
<#model_inf> ; . # The inference model <#model_inf> a
ja:InfModel ; ja:baseModel <#baseModel> ; ja:reasoner [
ja:reasonerURL
<http://jena.hpl.hp.com/2003/OWLFBRuleReasoner> ] . # The base
data. <#baseModel> a ja:MemoryModel ; ja:content
[ja:externalContent <file:Data/data.ttl> ] ; . -----------------

I use apache jena fuseki as server sparqlendpoint interface for
execute query sparql on an ontology OWL that is loaded on server
apache jena. The queries are executed through python languages. I
have need that the results of query must be the consequence of
process the reasoning. How I do at configure the reasoner with
apache jena fuseki? I use library sparqlwrapper for SPARQL
Endpoint interface to Python. # defines the URI of the endpoint
and the query to send uri = "http://localhost:3030/Hotel/query"
<http://www.semanticweb.org/ontologies/Hotel.owl#>
<http://www.semanticweb.org/ontologies/Hotel.owl#> "
"SELECT ?hotel ?price WHERE {" " ?hotel a :Hotel. "
" ?hotel :hasPrice ?price }") # obtain a connection to
the endpoint and sends the query sparql =
SPARQLEndpointInterface(uri) rs,fields = converter(sparql(query))
And this is the define the function sparql: def
__call__(self, statement): ''' This function sends the
query in string form to send. :Returns: resultset: the
result-set list in JSON format. ''' resultset = []
self._sparql.setQuery(statement)
self._sparql.setReturnFormat(JSON) print("SPARQLInterface is
executing the query...") try: t0 = time()
rs = self._sparql.query() tf = time() resultset
= rs.convert() print("Query has been executed
successfully!\nTime elapsed: {0:.3f} seconds.".format(tf-t0))
except: raise Exception("")
self._sparql.resetQuery() return resultset

[Andy Seaborne]

Sorry - that's unreadable.

Do you want to put it in a gist or something?

Andy

Post by Rocco
Hi andy,
I don't understand what are the configuration files to be edited.
I have the Hotel.ttl file in configuration/ directory and this is his
@prefix : <http://base/#> .
<http://jena.apache.org/fuseki#> . :service_tdb_all a fuseki:Service ;
rdfs:label "TDB Hotel" ; fuseki:dataset :tdb_dataset_readwrite ;
fuseki:name "Hotel" ; fuseki:serviceQuery "query" , "sparql" ;
fuseki:serviceReadGraphStore "get" ; fuseki:serviceReadWriteGraphStore
"data" ; fuseki:serviceUpdate "update" ; fuseki:serviceUpload "upload" .
:tdb_dataset_readwrite a tdb:DatasetTDB ; tdb:location
"C:\\Users\\Maiullari\\Desktop\\TESI\\Software\\apache-jena-fuseki-2.3.0\\run/databases/Hotel"
. and also I have the config.ttl file in run/ directory and this is his
content: # Licensed under the terms of
http://www.apache.org/licenses/LICENSE-2.0 ## Fuseki Server
<http://jena.hpl.hp.com/2005/11/Assembler#> . [] rdf:type fuseki:Server
; # Example:: # Server-wide query timeout. # # Timeout - server-wide
default: milliseconds. # Format 1: "1000" -- 1 second timeout # Format
2: "10000,60000" -- 10s timeout to first result, # then 60s timeout for
the rest of query. # # See javadoc for ARQ.queryTimeout for details. #
This can also be set on a per dataset basis in the dataset assembler. #
# ja:context [ ja:cxtName "arq:queryTimeout" ; ja:cxtValue "30000" ] ; #
Add any custom classes you want to load. # Must have a "public static
void init()" method. # ja:loadClass "your.code.Class" ; # End triples. .
Now, which file I have to edit between hotel.ttl and config.ttl? Can you
also tell me what are the values to be inserted in my case? Thanks in
adavanced.

Hi Andy, I have put in the configuration file (config.ttl) the
exactly code that you have sent me that present in this
page(https://github.com/apache/jena/blob/master/jena-fuseki2/examples/service-inference-1.ttl)
but the result of query are not changed.

Exactly? That is an example and you'll need to For example, your data
service is "Hotel/query" so the fuseki:name is "Hotel" not
"inf-mem". Maybe you want a different reasoner.

What is the problem?

What sort of reasoning are you expecting? What does the instance data
and the ontology look like? Andy

Thanks in adavanced. Rocco Il 18/11/2015 12:12, Andy Seaborne ha

Hi Rocco, To put in an inferencing dataset, you'll need to write a
configuration file. The UI can't create complex dataset setups. Put
the service and dataset description in the configuration/ directory
of the Fuseki area.
https://github.com/apache/jena/tree/master/jena-fuseki2/examples
----------------- # Dataset with only the default graph. <#dataset>
rdf:type ja:RDFDataset ; ja:defaultGraph <#model_inf>
; . # The inference model <#model_inf> a ja:InfModel ;
ja:baseModel <#baseModel> ; ja:reasoner [
ja:reasonerURL <http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>
] . # The base data. <#baseModel> a ja:MemoryModel ; ja:content
[ja:externalContent <file:Data/data.ttl> ] ; . -----------------

I use apache jena fuseki as server sparqlendpoint interface for
execute query sparql on an ontology OWL that is loaded on server
apache jena. The queries are executed through python languages. I
have need that the results of query must be the consequence of
process the reasoning. How I do at configure the reasoner with
apache jena fuseki? I use library sparqlwrapper for SPARQL
Endpoint interface to Python. # defines the URI of the endpoint
and the query to send uri = "http://localhost:3030/Hotel/query"
<http://www.semanticweb.org/ontologies/Hotel.owl#>
<http://www.semanticweb.org/ontologies/Hotel.owl#> " "SELECT
?hotel ?price WHERE {" " ?hotel a :Hotel. "
" ?hotel :hasPrice ?price }") # obtain a connection to the
endpoint and sends the query sparql = SPARQLEndpointInterface(uri)
rs,fields = converter(sparql(query)) And this is the define the
function sparql: def __call__(self, statement): '''
This function sends the query to the SPARQL end-point.
:Parameter: statement: query in string form to send.
:Returns: resultset: the result-set list in JSON format.
''' resultset = [] self._sparql.setQuery(statement)
self._sparql.setReturnFormat(JSON) print("SPARQLInterface is
executing the query...") try: t0 = time() rs =
self._sparql.query() tf = time() resultset =
rs.convert() print("Query has been executed
successfully!\nTime elapsed: {0:.3f} seconds.".format(tf-t0))
except: raise Exception("")
self._sparql.resetQuery() return resultset