JENA FRAMEWORK TUTORIAL

Jena: A Semantic Web Framework for Java Reporter C.F.Liao ( 廖峻鋒 ) May 17,2007

About Me ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RDF and OWL Processing API Model RDF Files Console Model I/O Model I/O Model CRUD OWL OWL OWL

Jena Inference Mechanism OWL OWL OWL ReasonerVocabulary Original Model Reasoner Rules Inferred Model

SPARQL (W3C Standard) Model SELECT ?x WHERE { ?x locatedIn classroom} … ?x = {Jane, Mary, and Peter} SPARQL Query Engine

Review: The RDF Network Light Switch1 state on Literal Resource Bedroom locatedIn size 9 contains TV1 Property

Key Abstractions Light Switch1 status on Bedroom locatedIn Browse the Jena Javadoc RDFNode

Recommended Development Environment ,[object Object],[object Object],[object Object]

Installing and Running Jena ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],demo

Downloading Jena ,[object Object]

Typical Jena Usage Scenario RDF Consumer (Jena) query RDF Files RDF Producer (Jena) Model (Memory) load add

Advanced Jena Usage Scenario Persistent RDF Model (Relational Database) RDF Publishing Server (Joseki) SPARQL over HTTP RDF Producer (Jena) Remote RDF Consumer (Jena)

Lab Creating a Simple RDF Model

Objectives ,[object Object],[object Object],[object Object],RDF Producer add print Model (Memory)

Creating RDF ,[object Object],[object Object],[object Object]

Creating a RDF statement ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(light,status,off) ex1 demo light1 status off Model

Model I/O ,[object Object],[object Object],System.out FileWriter Model

Loading RDF from an External File ,[object Object],[object Object],[object Object],[object Object],[object Object],src advai rdf smarthome.nt ReadRdfFromFileTest.java MyJenaProject ex2 demo bin ReadRdfFromFileTest.class

Dumping the Model ,[object Object],[object Object],[object Object],[object Object],System.out FileWriter ex3 demo Model

Model CRUD ,[object Object],[object Object],[object Object],[object Object],RDF Consumer (Jena) Model query

Navigating a Model ,[object Object],[object Object],[object Object],[object Object],RDF Consumer Model Reification ex4 demo query Subject Property Object

Querying Model ,[object Object],[object Object],[object Object],[object Object],[object Object],RDF Consumer Model Reification selector ex5 demo

Updating Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],RDF Consumer ex6 demo New object

Removing a Statement from Model ,[object Object],[object Object],[object Object],[object Object],[object Object],ex7 demo

Jena Inference Mechanism ReasonerRegistry RDFSReasoner Application Existing Model + Reasoner New Model (InfModel) ModelFactory Data (Model) GenericReasoner OwlReasoner ModelFactory InfModel

A Simple RDFS Reasoner Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],(Jane, teachesAt, NTU) RDFS Example demo (Jane, worksAt, NTU) teachesAt worksAt

Modeling a Domain with Schema and Data Schema Level Data Level

Separating Schema and Data ReasonerRegistry RDFSReasoner GenericReasoner Application Data (Model) Schema (OntModel) OwlReasoner ModelFactory InfModel

Example: The Smart Home Ontology locatedIn contains inverse transitive Building Room Person Light type type type Home Bedroom Jane type light1 contains locatedIn

Creating OntModel with Ontology API ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ex8 demo Inverse relationship Create 4 Class Definitions properties Model Configuration

A Ont Reasoner Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ex10 demo

Combining Generic and OWL Reasoners GenericReasoner Rules Data (Model) Schema (OntModel) OwlReasoner ontInfModel ModelFactory infModel ModelFactory

An “Openlight” Rule ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],“ if a person is in the bedroom then open all light”

Cascading Reasoners ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ex11 demo

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Querying Model with SPARQL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Sparql Demo

Persisting RDF Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JENA FRAMEWORK TUTORIAL

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