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| This page will be updated with Python examples related to the labs as the course progresses.
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| =Examples from the lectures=
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|
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| ==Lecture 1: Introduction to KGs==
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| Turtle example:
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| <syntaxhighlight>
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| @prefix ex: <http://example.org/> .
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| ex:Roger_Stone
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| ex:name "Roger Stone" ;
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| ex:occupation ex:lobbyist ;
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| ex:significant_person ex:Donald_Trump .
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| ex:Donald_Trump
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| ex:name "Donald Trump" .
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| </syntaxhighlight>
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|
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| ==Lecture 2: RDF==
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| Blank nodes for anonymity, or when we have not decided on a URI:
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| <syntaxhighlight lang="Python">
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| from rdflib import Graph, Namespace, Literal, BNode, RDF, RDFS, DC, FOAF, XSD
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|
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| EX = Namespace('http://example.org/')
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|
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| g = Graph()
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| g.bind('ex', EX) # this is why the line '@prefix ex: <http://example.org/> .'
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| # and the 'ex.' prefix are used when we print out Turtle later
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|
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| robertMueller = BNode()
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| g.add((robertMueller, RDF.type, EX.Human))
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| g.add((robertMueller, FOAF.name, Literal('Robert Mueller', lang='en')))
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| g.add((robertMueller, EX.position_held, Literal('Director of the Federal Bureau of Investigation', lang='en')))
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|
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| print(g.serialize(format='turtle'))
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| </syntaxhighlight>
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|
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| Blank nodes used to group related properties:
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| <syntaxhighlight>
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| from rdflib import Graph, Namespace, Literal, BNode, RDF, RDFS, DC, FOAF, XSD
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|
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| EX = Namespace('http://example.org/')
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|
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| g = Graph()
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| g.bind('ex', EX)
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|
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| # This is a task in Exercise 2
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|
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| print(g.serialize(format='turtle'))
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| </syntaxhighlight>
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|
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| Literals:
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| <syntaxhighlight>
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| from rdflib import Graph, Namespace, Literal, BNode, RDF, RDFS, DC, FOAF, XSD
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|
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| EX = Namespace('http://example.org/')
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|
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| g = Graph()
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| g.bind('ex', EX)
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|
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| g.add((EX.Robert_Mueller, RDF.type, EX.Human))
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| g.add((EX.Robert_Mueller, FOAF.name, Literal('Robert Mueller', lang='en')))
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| g.add((EX.Robert_Mueller, FOAF.name, Literal('رابرت مولر', lang='fa')))
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| g.add((EX.Robert_Mueller, DC.description, Literal('sixth director of the FBI', datatype=XSD.string)))
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| g.add((EX.Robert_Mueller, EX.start_time, Literal(2001, datatype=XSD.integer)))
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|
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| print(g.serialize(format='turtle'))
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| </syntaxhighlight>
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|
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| Alternative container (open):
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| <syntaxhighlight>
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| from rdflib import Graph, Namespace, Literal, BNode, RDF, RDFS, DC, FOAF, XSD
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|
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| EX = Namespace('http://example.org/')
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|
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| g = Graph()
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| g.bind('ex', EX)
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|
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| muellerReportArchives = BNode()
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| g.add((muellerReportArchives, RDF.type, RDF.Alt))
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|
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| archive1 = 'https://archive.org/details/MuellerReportVolume1Searchable/' \
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| 'Mueller%20Report%20Volume%201%20Searchable/'
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| archive2 = 'https://edition.cnn.com/2019/04/18/politics/full-mueller-report-pdf/index.html'
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| archive3 = 'https://www.politico.com/story/2019/04/18/mueller-report-pdf-download-text-file-1280891'
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|
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| g.add((muellerReportArchives, RDFS.member, Literal(archive1, datatype=XSD.anyURI)))
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| g.add((muellerReportArchives, RDFS.member, Literal(archive2, datatype=XSD.anyURI)))
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| g.add((muellerReportArchives, RDFS.member, Literal(archive3, datatype=XSD.anyURI)))
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|
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| g.add((EX.Mueller_Report, RDF.type, FOAF.Document))
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| g.add((EX.Mueller_Report, DC.contributor, EX.Robert_Mueller))
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| g.add((EX.Mueller_Report, SCHEMA.archivedAt, muellerReportArchives))
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|
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| print(g.serialize(format='turtle'))
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| </syntaxhighlight>
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|
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| Sequence container (open):
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| <syntaxhighlight>
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| from rdflib import Graph, Namespace, Literal, BNode, RDF, RDFS, DC, FOAF, XSD
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|
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| EX = Namespace('http://example.org/')
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|
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| g = Graph()
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| g.bind('ex', EX)
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|
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| donaldTrumpSpouses = BNode()
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| g.add((donaldTrumpSpouses, RDF.type, RDF.Seq))
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| g.add((donaldTrumpSpouses, RDF._1, EX.IvanaTrump))
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| g.add((donaldTrumpSpouses, RDF._2, EX.MarlaMaples))
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| g.add((donaldTrumpSpouses, RDF._3, EX.MelaniaTrump))
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|
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| g.add((EX.Donald_Trump, SCHEMA.spouse, donaldTrumpSpouses))
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|
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| print(g.serialize(format='turtle'))
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| </syntaxhighlight>
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|
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| Collection (closed list):
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| <syntaxhighlight>
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| from rdflib import Graph, Namespace, Literal, BNode, RDF, RDFS, DC, FOAF, XSD
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|
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| EX = Namespace('http://example.org/')
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|
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| g = Graph()
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| g.bind('ex', EX)
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|
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| from rdflib.collection import Collection
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|
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| g = Graph()
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| g.bind('ex', EX)
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|
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| donaldTrumpSpouses = BNode()
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| Collection(g, donaldTrumpSpouses, [
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| EX.IvanaTrump, EX.MarlaMaples, EX.MelaniaTrump
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| ])
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| g.add((EX.Donald_Trump, SCHEMA.spouse, donaldTrumpSpouses))
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|
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| print(g.serialize(format='turtle'))
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| g.serialize(destination='s02_Donald_Trump_spouses_list.ttl', format='turtle')
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|
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| print(g.serialize(format='turtle'))
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| </syntaxhighlight>
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|
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|
| =Example lab solutions= | | =Example lab solutions= |
