1. SPARQL Exercise
Much of this exercise has been copied from: INF3580/INF4580 – MANDATORY EXERCISE 3
gsmateriale/oblig3.pdf

2. Copy the Turtle defined ontology on next slide to an ”
Copy the Turtle defined ontology on next slide to an ”.owl” file and load it into Protégé.

3. @prefix : <http://www. simpsons. no/simpsonsfamily#>
@prefix : < foaf: < owl: < rdf: < xml: < xsd: < rdfs: < . < rdf:type owl:Ontology . ################################################################# # # Object Properties :hasBrother rdf:type owl:ObjectProperty . :hasParent rdf:type owl:ObjectProperty . :hasSister rdf:type owl:ObjectProperty . :hasUncle rdf:type owl:ObjectProperty . :hasFamilyMember rdf:type owl:ObjectProperty . :hasSpouse rdf:type owl:ObjectProperty . :hasFather rdf:type owl:ObjectProperty . :hasMother rdf:type owl:ObjectProperty . # Data properties :birthday rdf:type owl:DatatypeProperty ; rdfs:range xsd:dateTime . :diedOn rdf:type owl:DatatypeProperty ; :hasName rdf:type owl:DatatypeProperty ; rdfs:range xsd:string . # Classes :Family rdf:type owl:Class . :Man rdf:type owl:Class ; rdfs:subClassOf foaf:Person . :Woman rdf:type owl:Class ; #################################################################### :Homer a foaf:Person ; foaf:age "36"^^xsd:int ; foaf:name "Homer Simpson" . :Marge foaf:age "34"^^xsd:int ; foaf:name "Marge Simpson" . :Lisa foaf:age "8"^^xsd:int ; foaf:name "Lisa Simpson" . :Bart foaf:age "10"^^xsd:int ; foaf:name "Bart Simpson" . :Maggie foaf:age "1"^^xsd:int ; foaf:name "Maggie Simpson" . :Simpsons a :Family ; :hasFamilyMember :Maggie , :Homer , :Lisa , :Bart, :Marge . :hasSpouse :Marge . :hasSpouse :Homer . :hasFather :Homer ; :hasMother :Marge . :Abraham a foaf:Person . :hasParent [ a foaf:Person ; :hasFather :Abraham ] . :Mona a foaf:Person . :hasMother :Mona :hasSister :Patty , :Selma ] ; :hasBrother :Herb :Herb a foaf:Person . :Patty a foaf:Person ; :hasSister :Selma . :Selma :hasSister :Patty . :hasSpouse

4. Task 1
Query: Find all Persons and order them by identifier, list also optionally their name. Use the result variable names ?person, ?name . Tip: This is a simple query, where you will need to use SELECT, WHERE, OPTIONAL and ORDER BY . If you do not get any results, try the query SELECT ?s ?p ?o WHERE {?s ?p ?o} and see if your get the expected results and namespaces. This query lists all triples in the graph.

5. Task 1
Query: Find all Persons and order them by identifier, list also optionally their name. Use the result variable names ?person, ?name . Proposed Solution: PREFIX : < PREFIX foaf: < PREFIX rdf: < PREFIX owl: < PREFIX rdfs: < PREFIX xsd: < SELECT ?person ?name WHERE { ?person a foaf:Person OPTIONAL {?person foaf:name ?name}} ORDER BY ?person

6. Task 2
Query: Find everyone who has a mother and list both the person and the mother. Order by mother.
PREFIX : <
PREFIX foaf: <
PREFIX rdf: <
PREFIX owl: <
PREFIX rdfs: <
PREFIX xsd: <
SELECT ?person ?mother
WHERE { ?person :hasMother ?mother
} ORDER BY ?mother

7. Task 3
Query: Find everyone who has a mother or a father and list both the person and the mother or father. Order by mother/father.
PREFIX : <
PREFIX foaf: <
PREFIX rdf: <
PREFIX owl: <
PREFIX rdfs: <
PREFIX xsd: <
SELECT DISTINCT ?person ?mother ?father
WHERE { {?person :hasMother ?m}
UNION
{?person :hasFather ?f }
OPTIONAL {?person :hasMother ?mother}
OPTIONAL {?person :hasFather ?father}
} ORDER BY ?mother ?father

8. Task 4
Query: Find all of Maggie’s grandmothers. Result variable name: ?grandmother .
PREFIX : <
PREFIX foaf: <
PREFIX rdf: <
PREFIX owl: <
PREFIX rdfs: <
PREFIX xsd: <
SELECT ?grandmother
WHERE { :Maggie :hasParent ?parent.
?parent :hasMother ?grandmother
} ORDER BY ?mother
May be improved with help of :more triples with :hasMother/:hasFather + OPTIONAL

9. Task 5
Query: Find everyone older than 10. Order by age, oldest first. Output name and age. Result variable names: ?person, ?age .
PREFIX : <
PREFIX foaf: <
PREFIX rdf: <
PREFIX owl: <
PREFIX rdfs: <
PREFIX xsd: <
SELECT ?person ?age
WHERE { ?person foaf:age ?age .
FILTER (?age > "10"^^xsd:int )
} ORDER BY ?age

10. Task 6
Query: Is Herb the brother of Homer? (We know Homer has a brother named Herb, but here the question is: Do the ontology contain this information?) Use SPARQL construct ASK.
PREFIX : <
PREFIX foaf: <
PREFIX rdf: <
PREFIX owl: <
PREFIX rdfs: <
PREFIX xsd: <
ASK { :Homer :hasBrother :Herb }
# There are some information about brotherhood in the ontology
(in blank nodes), but not enough …