week 3

Question 1

two options for publishing RDF

Answer 1

1.make RDF file available on web server.

2. make RDF data available in a programmatic way via http API
   when we publish data we also want to access it:
   - load files directly into python program
   - acces data via SPARQL
   - g.add((s,p,o)) to add data to program

Question 2

triplestore

Answer 2

a database that has been built on purpose to be able to be efficient when dealing with graph data and RDF data, optimized for fast querying by the use of dictionaries/indexing/statistics

Question 3

calculating with knowledge

Answer 3

= inferencing or reasoning

Question 4

inferencing

Answer 4

the algorithmic manipulation of knowledge in order to derive new implicit facts from explicitly stated knowledge.

Question 5

generic knowledge

Answer 5

represented by classes. a class denotes a set of individuals

Question 6

factual knowledge

Answer 6

represent by individuals/instances. individuals represent single individual objects

Question 7

property

Answer 7

represents a relation between classes and individuals

Question 8

T-box

Answer 8

what kind of things are true in my world

Question 9

A-box

Answer 9

facts about the instances

Question 10

formulas

Answer 10

axioms that restrict the possible interpretations of the world

Question 11

thesauri

Answer 11

standard terminology in a particular domain, often a hierarchy without formal semantics, developed by a community over the years, legacy problem: cannot just change the current practice

Question 12

RDFS

Answer 12

a vocabulary that builds on RDF
- allows us to express basic relations between classes, instances, properties, domain etc.
- provide entailment rules

Question 13

using vocabularies allows us to…

Answer 13

reuse and integrate data
- at instance and schema level
- vocabularies often have social semenantics