Lab: Group project ideas / SPARQL

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Lab 3: Group project ideas / SPARQL

Topics

  • Meeting with Andreas to discuss group project idea.
  • Setting up the Blazegraph graph database.
  • SPARQL queries and updates.

Meeting with Andreas

One group at the time will go and talk to Andreas Lothe Opdahl about their group project idea. This is an opportunity to get early feedback for the programming project that you will develop throughout the semester. The office of Andreas is in Room 609 on the 6th floor of the SV-building next door(Laurits Melzers house).

Remember, we have a wiki page (linked below) that describes details about the group project, including some example ideas.


Tasks

Installing Blazegraph on your own computer

Download Blazegraph (blazegraph.jar) from here: https://blazegraph.com/ Navigate to blazegraph.jar in your commandline/terminal. Now run this command:

java -server -Xmx4g -jar blazegraph.jar

It should now display an url like: "http://10.0.0.13:9999/blazegraph/". Open this in a browser.

You can now run SPARQL queries and updates and load RDF graphs from your file into Blazegraph. In the update tab, load RDF data (select type below) and then paste the contents of your turtle/.txt file to add them all at once to the database. If you have not serialized your graph from lab 2 yet, you can use the triples on the bottom of the page instead.


Write the following SPARQL queries:

  • SELECT all triples in your graph.
  • SELECT all the interests of Cade.
  • SELECT the city and country of Emma.
  • SELECT the city and country of where Emma lives.
  • SELECT only people who are older than 26.
  • SELECT Everyone who graduated with a Bachelor Degree.

Use SPARQL Update's DELETE DATA to delete the age of Cade. Run your SPARQL query again to check that the graph has changed.

Use INSERT DATA to add information about Sergio Pastor, who lives in 4 Carrer del Serpis, 46021 Valencia, Spain. he has a M.Sc. in computer from the University of Valencia from 2008. His areas of expertise include big data, semantic technologies and machine learning.

Write a SPARQL DELETE/INSERT update to change the name of "University of Valencia" to "Universidad de Valencia" whereever it occurs.

Write a SPARQL DESCRIBE query to get basic information about the University of Valencia.

If you have more time

Redo all the above steps, this time writing a Python/RDFlib program. You can look at the python example page to see how to connect to your blazegraph database in Python and perform some basic queries.


Useful Links

About the programming project

Lecture Notes

Triples that you can base your queries on: (turtle format)

@prefix ex: <http://example.org/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

ex:Cade a foaf:Person ;
    ex:address [ a ex:Address ;
            ex:city ex:Berkeley ;
            ex:country ex:USA ;
            ex:postalCode "94709"^^xsd:string ;
            ex:state ex:California ;
            ex:street "1516_Henry_Street"^^xsd:string ] ;
    ex:age 27 ;
    ex:characteristic ex:Kind ;
    ex:degree [ ex:degreeField ex:Biology ;
            ex:degreeLevel "Bachelor"^^xsd:string ;
            ex:degreeSource ex:University_of_California ;
            ex:year "2011-01-01"^^xsd:gYear ] ;
    ex:interest ex:Bird,
        ex:Ecology,
        ex:Environmentalism,
        ex:Photography,
        ex:Travelling ;
    ex:married ex:Mary ;
    ex:meeting ex:Meeting1 ;
    ex:visit ex:Canada,
        ex:France,
        ex:Germany ;
    foaf:knows ex:Emma ;
    foaf:name "Cade_Tracey"^^xsd:string .

ex:Mary a ex:Student,
        foaf:Person ;
    ex:age 26 ;
    ex:characteristic ex:Kind ;
    ex:interest ex:Biology,
        ex:Chocolate,
        ex:Hiking .

ex:Emma a foaf:Person ;
    ex:address [ a ex:Address ;
            ex:city ex:Valencia ;
            ex:country ex:Spain ;
            ex:postalCode "46020"^^xsd:string ;
            ex:street "Carrer_de_la Guardia_Civil_20"^^xsd:string ] ;
    ex:age 26 ;
    ex:degree [ ex:degreeField ex:Chemistry ;
            ex:degreeLevel "Master" ;
            ex:degreeSource ex:University_of_Valencia ;
            ex:year "2015-01-01"^^xsd:gYear ] ;
    ex:expertise ex:Air_Pollution,
        ex:Toxic_Waste,
        ex:Waste_Management ;
    ex:interest ex:Bike_Riding,
        ex:Music,
        ex:Travelling ;
    ex:meeting ex:Meeting1 ;
    ex:visit ( ex:Portugal ex:Italy ex:France ex:Germany ex:Denmark ex:Sweden ) ;
    foaf:name "Emma_Dominguez"^^xsd:string .

ex:Meeting1 a ex:Meeting ;
    ex:date "August, 2014"^^xsd:string ;
    ex:involved ex:Cade,
        ex:Emma ;
    ex:location ex:Paris .

ex:Paris a ex:City ;
    ex:capitalOf ex:France ;
    ex:locatedIn ex:France .

ex:France ex:capital ex:Paris .