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  1. CS-E4410
  2. 2. Producing RDF data and RDFS ontologies
  3. 2.2 Exploring and reading Linked Data

Exploring and reading Linked Data

Explore the resource Helsinki in DBpedia by opening the URI that identifies the RDF resource http://dbpedia.org/resource/Helsinki in a web browser. This leads by a redirection to a Linked Data browser, which displays the resource’s properties and their values in a human-readable format.

Follow the links from the resource and examine Edvard Westermarck, who was born in Helsinki. What is he known for? Birth place is given by the property http://dbpedia.org/ontology/birthPlace and what a person is known for is given by the property http://dbpedia.org/ontology/knownFor.

The answer is expected to be a single phrase, not a complete sentence.

In this assignment you will get aquainted with the RDF serialization of the DBpedia resource Helsinki. You can use a HTTP client to get to download the data, but a simler way is to go to the resource page at http://dbpedia.org/resource/Helsinki, click formats on top of the page and choose turtle. Direct link to the Turtle representation of the Helsinki resource is https://dbpedia.org/data/Helsinki.ttl

If your computer has the wget tool or similar HTTP client installed (the assignment session computer class Windows computers don’t have), send an HTTP request to the URI of Helsinki, http://dbpedia.org/resource/Helsinki. Set a suitable Accept header (HTTP header) to get the response in RDF format. For example wget parameter --header="Accept: text/turtle" gives the response serialized in the Turtle format. You will see from the wget output that the requested RDF serialization was returned through a redirection (HTTP 303 See Other). If your computer doesn’t have wget installed and you don’t want to install it, you can establish an SSH connection to an Aalto University general purpose server, for example kosh.aalto.fi, and run the command there. Your Aalto Windows home directory is visible on kosh.aalto.fi at directory ‘../data’ so you can save the wget output there and examine it in Windows.

Give a triple that tells that DBpedia Helsinki is the same thing (owl:sameAs) as the Geonames Helsinki. There are currently 2 (or 3) Helsinki Geonames resources referenced, so you can return anyone of those.

Give the triple as it is described in the downloaded file i.e. use the prefixes as they are used in the file. Submit only the triple. The prefixes are assumed to be defined in the file.

Posting submission...