Jena based framework to implement ontological mediation of SPARQL queries
Switch branches/tags
Nothing to show
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Failed to load latest commit information.
lib
resources
src/uk/soton
test/uk/soton
.classpath
.project
README.md
build.xml

README.md

Mediation toolkit

It's a lightweight toolkit to implement ontological mediation over RDF. It uses ontology mappings in order to rewrite SPARQL SELECT queries and to generate SPARQL CONSTRUCT queries to import an external data set.

API

The tool is divided in the following packages:

The ontology alignments are represented as RDF files and describe rewriting rules that allows to define class mappings:


	[]    <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
              <http://ecs.soton.ac.uk/om.owl#Alignment> ;
      <http://ecs.soton.ac.uk/om.owl#hasEntityAlignment>
              [ <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
                        <http://ecs.soton.ac.uk/om.owl#EntityAlignment> ;
                <http://ecs.soton.ac.uk/om.owl#hasRelation>
                        <http://ecs.soton.ac.uk/om.owl#EQ> ;
                <http://ecs.soton.ac.uk/om.owl#lhs>
                        [ <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#object>
                                  <http://correndo.ecs.soton.ac.uk/ontology/target#Boiler> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
                                  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
                                  _:b1
                        ] ;
                <http://ecs.soton.ac.uk/om.owl#rhs>
                        [ <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#object>
                                  <http://correndo.ecs.soton.ac.uk/ontology/source#Kettle> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
                                  <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
                                  _:b1
                        ]
              ] ;

...property mappings:

      <http://ecs.soton.ac.uk/om.owl#hasEntityAlignment>
              [ <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
                        <http://ecs.soton.ac.uk/om.owl#EntityAlignment> ;
                <http://ecs.soton.ac.uk/om.owl#hasRelation>
                        <http://ecs.soton.ac.uk/om.owl#EQ> ;
                <http://ecs.soton.ac.uk/om.owl#lhs>
                        [ <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#object>
                                  _:b2 ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
                                  <http://correndo.ecs.soton.ac.uk/ontology/target#boiler> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
                                  _:b3
                        ] ;
                <http://ecs.soton.ac.uk/om.owl#rhs>
                        [ <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#object>
                                  _:b2 ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
                                  <http://correndo.ecs.soton.ac.uk/ontology/source#hasKettle> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
                                  _:b3
                        ]
              ] ;

...and data manipulation:

      <http://ecs.soton.ac.uk/om.owl#hasEntityAlignment>
              [ <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
                        <http://ecs.soton.ac.uk/om.owl#EntityAlignment> ;
                <http://ecs.soton.ac.uk/om.owl#hasFunctionalDependency>
                        [ <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#object>
                                  [ <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
                                            <http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq> ;
                                    <http://www.w3.org/1999/02/22-rdf-syntax-ns#_1>
                                            _:b4 ;
                                    <http://www.w3.org/1999/02/22-rdf-syntax-ns#_2>
                                            273.15
                                  ] ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
                                  <http://www.w3.org/2005/xpath-functions/sub> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
                                  _:b5
                        ] ;
                        <http://ecs.soton.ac.uk/om.owl#hasRelation>
                        <http://ecs.soton.ac.uk/om.owl#EQ> ;
                <http://ecs.soton.ac.uk/om.owl#lhs>
                        [ <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#object>
                                  _:b4 ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
                                  <http://correndo.ecs.soton.ac.uk/ontology/target#temp> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
                                  _:b6
                        ] ;
                <http://ecs.soton.ac.uk/om.owl#rhs>
                        [ <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#object>
                                  _:b5 ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate>
                                  <http://correndo.ecs.soton.ac.uk/ontology/source#hasTemperature> ;
                          <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>
                                  _:b6
                        ]
              ] ;

Once loaded an alignment the tool allows to rewrite a SPARQL SELECT query in order to fit a given schema:

[kettle-boiler] original query:

	PREFIX  rdfs: <http://www.w3.org/2000/01/rdf-schema#>
	PREFIX  source: <http://correndo.ecs.soton.ac.uk/ontology/source#>
	PREFIX  owl:  <http://www.w3.org/2002/07/owl#>
	PREFIX  rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
	SELECT DISTINCT  ?v ?y ?z ?lt
	WHERE
	{ ?v rdf:type source:Person .
	?v source:hasKettle ?y .
	?v source:hasKettle ?l .
	?y source:hasTemperature 10 .
	?l source:hasTemperature ?lt .
	} LIMIT   10

[kettle-boiler] translated query:

	SELECT DISTINCT  ?v ?y ?z ?lt
	WHERE
	{ ?v   <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>  <http://correndo.ecs.soton.ac.uk/ontology/target#User> ;
	       <http://correndo.ecs.soton.ac.uk/ontology/target#boiler>  ?y ;
	       <http://correndo.ecs.soton.ac.uk/ontology/target#boiler>  ?l ;
	?y   <http://correndo.ecs.soton.ac.uk/ontology/target#temp>  283.15 .
	?l  <http://correndo.ecs.soton.ac.uk/ontology/target#temp>  ?_12 .
	LET (?lt := ( ?_12 - 273.15 ))
	} LIMIT   10