ADVANCED ASPECTS OF SPARQL QUERY LANGUAGE

Alen Roguljić (2014) ADVANCED ASPECTS OF SPARQL QUERY LANGUAGE. EngD thesis.

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Abstract

There are a lot of data on the web that is comprehensible only for humans. But what about the data understandable to computers which could help gather all the necessary data for the user, all in one place. The web site connections exist quite a while, but the main goal of sematic web is to enable the connections not only between web sites, but also between the data which could help computers understand and later help people with faster and more elective search. But for all that to be possible, it is necessary for us, to save the data into the RDF form, which allows us enquire with SPARQL query language. This is why we have developed a program that shows and allows us to use advanced key words for query on distant SPARQL endpoints, such as endpoint which store data about news from 24ur website and DBPedia, and enquire on local RDF _le, which also allows us to insert the data. The main purpose was to show SPARQL's use of advanced keywords mainly with equiries, since we know that equiries or so called SELECT queries are most commonly used in query languages. It was also vital to show the advanced functions of SPARQL. The program is mainly based on the news from 24ur domain and DBPedia. We have also enabled a function, that allows us to create our own news, that are saved into the local RDF _le and are later allowed to use in equeries. We also wanted to show the user the operation of distributed queries that are used for enqueries from multiple distant end-points at a time.

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