Semantic query rules tools Inference triple stores etc

Semantic query, rules, tools (Inference, triple stores, etc) 1

2

Semantic Web Layers 3

4

Ontology Spectrum 5

Ontology - declarative knowledge 6

What is Query? 7

SPARQL 8

SPARQL Solution Modifiers 9

Query examples 10

What happens 11

Using SPARQL with Jena 12

com. hpl. jena. query package // Open the bloggers RDF graph from the filesystem Input. Stream in = new File. Input. Stream(new File("bloggers. rdf")); // Create an empty in-memory model and populate it from the graph Model model = Model. Factory. create. Mem. Model. Maker(). create. Model(); model. read(in, null); // null base URI, since model URIs are absolute in. close(); // Create a new query String query. String = "PREFIX foaf: " + "SELECT ? url " + "WHERE {" + " ? contributor foaf: name "Jon Foobar". " + " ? contributor foaf: weblog ? url. " + " }”; Query query = Query. Factory. create(query. String); // Execute the query and obtain results Query. Execution qe = Query. Execution. Factory. create(query, model); Result. Set results = qe. exec. Select(); // Output query results Result. Set. Formatter. out(System. out, results, query); // Important - free up resources used running the query qe. close(); 13

More complex queries 14

15

16

17

18

19

20

Returning as XML 21

Final example 22

2 -page reference guide 23

Using Protégé 24

25

Rules - expressing logic 26

27

Examples 28

Rule Interchange Format (RIF) 29

30

More RIF testing 31

Testing class membership 32

XML for conclusion 33

34

Examples 35

36

Negation 37

Multiple rules, split disjunction 38

Using Protégé 39

Inference structure 40

Lastly and briefly 41

Implementation 42

Languages 43

RDFS 44

However 45

OWL requirements 46

The OWL language: 47

48

OWL Class Constructors 49

OWL axioms 50

SKOS properties 51

SKOS core and RDFS/OWL 52

OWL 2

Tutorial Summary 54