example:alice example:knows example:bob example:alice example:name "Alice" example:alice example:bob example:knows

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2 example:alice example:knows example:bob example:alice example:name "Alice" example:alice example:bob example:knows

3 example:person example:knows example:person

4 example:person, example:woman, example:institute, example:city example:alice, example:ntua, example:athens rdf:type example:alice rdf:type example:woman example:ntua rdf:type example:institution

5 rdfs:resource rdfs:class example:person rdf:type rdfs:class example:institution rdf:type rdfs:class rdf:property example:knowns rdf:type rdf:property example:studies rdf:type rdf:property rdfs:literal

6 rdf:type example:alice rdf:type example:person example:alice a example:person rdfs:subclassof example:male rdfs:subclassof example:person rdfs:subpropertyof example:isfriendof rdfs:subclassof example:knows rdfs:domain example:knowns rdfs:domain example:person rdfs:range example:knowns rdfs:range example:person example:name rdfs:range rdfs:literal

7 rdf:label example:alice rdfs:label "Alice Smith" rdfs:comment example:person rdfs:comment "Το σύνολο όλων των ανθρώπων"

8 example:person rdf:type rdfs:class example:person rdfs:comment "Το σύνολο όλων των ανθρώπων" example:woman rdf:type rdfs:class example:woman rdfs:subclassof example:person example:man rdf:type rdfs:class example:man rdfs:subclassof example:person example:knows rdf:type rdf:property example:knows rdfs:domain example:person example:knows rdfs:range example:person example:alice rdf:type example:woman example:alice rdfs:label "Alice Smith" example:bob rdf:type example:man example:bob rdfs:label "Bob Ryan" example:bob rdfs:knows example:alice

9 example:alice example:alice example:alice rdf:type example:woman example:woman rdfs:subclassof example:person example:alice rdf:type example:person

10 :bob :knows :alice :alice rdf:type :Woman :alice :livesin :Athens :NTUA :islocatedin :Athens :Athens :capitalof :Greece :alice :bob :Woman :NTUA :Athens :Greece rdf:type :knows :livesin :islocatedin :capitalof

11 SELECT WHERE PREFIX ex: < SELECT?x?y?z WHERE {?x?y?z.?z rdf:type ex:person }

12 ex:alice ex:name "Alice Smith" ; rdf:type ex:person ex:bob ex:name "Bob Ryan" ; rdf:type ex:person ex:john ex:name "John Taylor" ; rdf:type ex:person ex:alice ex:knows ex:bob ex:john ex:knows ex:bob PREFIX ex: < SELECT?x?name WHERE {?person ex:name?name } ex:alice "Alice Smith" ex:bob "Bob Ryan" ex:john "John Taylor"

13 ex:alice ex:name "Alice Smith" ; rdf:type ex:person ex:bob ex:name "Bob Ryan" ; rdf:type ex:person ex:john ex:name "John Taylor" ; rdf:type ex:person ex:alice ex:knows ex:bob ex:john ex:knows ex:bob SELECT?x?name WHERE {?x rdf:type ex:person. }?x ex:knows?y.?y ex:name?name } ex:alice ex:john "Bob Ryan" "Bob Ryan"

14 ex:alice ex:name "Alice Smith" ; rdf:type ex:person ex:bob ex:name "Bob Ryan" ; rdf:type ex:person ex:john ex:name "John Taylor" ; rdf:type ex:person ex:alice ex:knows ex:bob ex:john ex:knows ex:bob SELECT?x WHERE {?x rdf:type example:person.?x example:name "John Taylor" } ex:john

15 SELECT?x?age WHERE {?x rdf:type example:person.?x example:age?age. FILTER (?age > 25) } SELECT?x? WHERE {?x rdf:type example:person. OPTIONAL {?x example: ? } } SELECT?x?tel WHERE {?x rdf:type example:person. {?x example:telephone?tel } UNION {?x example:mobile?tel } }

16 SELECT?prop WHERE {?prop rdf:type rdf:property } ex:publishes rdf:type rdf:property SELECT?pub WHERE {?pub rdf:type ex:publication } ex:book1 ex:book1 ex:book2 rdf:type ex:publication ex:book3 rdf:type ex:publication

17 Dublin Core FOAF SKOS Schema.org

18 contributor coverage creator date description format identifier language publisher relation rights source subject title type abstract dateaccepted datecopyrighted ispartof isreferencedby extend Agent BibliographicResource LinguisticSystem Location PeriodOfTime PhysicalMedium PhysicalResource SizeOrDuration

19 dctems:creator dcterms:creator rdf:type rdfs:property dcterms:creator rdfs:label dcterms:creator rdfs:comment "An entity primarily responsible for making the dcterms:creator rdfs:range dcterms:agent dcterms:creator rdfs:subpropertyof dcterms:contributor example:merchofven dcterms:title "Merchant of example:merchofven dcterms:creator example:shakespeare example:merchofven dcterms:created "1689" example:shakespeare foaf:familyname "Shakespeare" example:shakespeare foaf:givenname "William"

20 Agent Person Project Organization Group Document Image name title img depicts familyname givenname knows based_near age made primarytopic member nick homepage weblog account schoolhomepage currentproject pastproject

21 ex:jim rdf:type foaf:person ex:jim foaf:name "Jimmy Wales" ex:jim foaf:mbox ex:jim foaf:homepage < ex:jim foaf:nick "Jimbo" ex:jim foaf:depiction < ex:jim foaf:interest < ex:jim foaf:knows ex:mary ex:mary rdf:type foaf:person ex:mary foaf:name "Mary Beesley"

22 skos:concept skos:preflabel skos:altlabel skos:hiddenlabel example:animals rdf:type skos:concept example:animals skos:preflabel example:animals skos:altlabel example:animals skos:preflabel example:animals skos:altlabel example:animals skos:hiddenlabel

23 skos:broader skos:narrower skos:related example:animals rdf:type skos:concept example:animals skos:preflabel example:mammals rdf:type skos:concept example:mammals skos:preflabel example:zoology rdf:type skos:concept example:zoology skos:preflabel example:animals skos:narrower example:mammals example:mammals skos:broader example:animals example:animals skos:related example:zoology skos:broader skos:narrower

24 skos:note skos:definition skos:example skos:scopenote skos:historynote skos:editorialnote skos:changenote example:microwavefrequencies skos:scopenote "Used for frequencies between 1GHz to example:organizationsofscienceandculture skos:example "academies of science, general museums, world example:documentation skos:definition "the process of storing and retrieving information in all fields of example:childabuse skos:historynote "est. 1975; heading was: Cruelty to children

25 skos:conceptscheme skos:inscheme skos:hastopconcept example:animalthesaurus rdf:type skos:conceptscheme example:animalthesaurus dcterms:title "Simple animal thesaurus" example:mammals rdf:type skos:concept example:mammals skos:inscheme example:animalthesaurus example:fish rdf:type skos:concept example:fish skos:inscheme example:animalthesaurus example:animalthesaurus skos:hastopconcept example:mammals example:animalthesaurus skos:hastopconcept example:fish

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27 Action BroadcastService CreativeWork Event Intangible MedicalEntity Organization Person Place Product CreativeWork CreativeWork Article BlogPosting NewsArticle ScholarlyArticle MedicalScholarlyArticle Blog Book Clip MovieClip RadioClip TVClip

28 schema:creativework schema:character schema:contributor schema:comment schema:datecreated schema:haspart schema:headline schema:inlanguage schema:keywords schema:mentions schema:translator schema:person schema:person, schema:organization schema:comment schema:date schema:creativework schema:text schema:language schema:text schema:text schema:thing schema:person, schema:organization

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30 itemscope itemprop <div itemscope> <p>my name is <span itemprop="name">elizabeth</span>.</p> <p>i am <span itemprop="nationality">british</span>.</p> <p>i was born on <data itemprop="birthday" value=" ">may 10th 2009</data>.</p> </div>

31 itemtype <div itemscope itemtype="schema:person"> <p>my name is <span itemprop="schema:givenname">elizabeth</span>.</p> <p>i am <span itemprop="schema:nationality">british</span>.</p> <p>i was born on <data itemprop="schema:birthdate" value=" ">may 10th 2009</data>.</p> </div>