NanoSocrates/docs/DBPEDIA.md

# DBPedia

## GraphIRI

This is the graph identifier (URI):

`http://dbpedia.org`

## History of queries

```SQL
PREFIX dbo:  <http://dbpedia.org/ontology/>
PREFIX dbp:  <http://dbpedia.org/property/>
PREFIX dbr:  <http://dbpedia.org/resource/>

SELECT ?subject, ?relationship, ?object
WHERE {
  ?subject ?relationship ?object .
  {
    SELECT ?object
    WHERE {
      ?m rdf:type dbo:Film .
      ?object ?r ?m
    }
  }
}
```

### 2 Hops

```SQL
PREFIX dbo:  <http://dbpedia.org/ontology/>
PREFIX dbp:  <http://dbpedia.org/property/>
PREFIX dbr:  <http://dbpedia.org/resource/>

SELECT ?subject, ?relationship, ?object
WHERE {
  ?subject ?relationship ?object .
  FILTER (?relationship != <http://dbpedia.org/ontology/wikiPageWikiLink>)
  {
    SELECT ?object
    WHERE {
      ?m rdf:type dbo:Film .
      ?object ?r ?m
      FILTER (?r != <http://dbpedia.org/ontology/wikiPageWikiLink>)
    }
  }
}
LIMIT 1000000
```

### 1 Hop

```SQL
PREFIX dbo:  <http://dbpedia.org/ontology/>
PREFIX dbp:  <http://dbpedia.org/property/>
PREFIX dbr:  <http://dbpedia.org/resource/>

SELECT ?subject, ?relationship, ?object
WHERE {
  ?subject ?relationship ?object .
  ?object rdf:type dbo:Film .
  FILTER (?relationship != <http://dbpedia.org/ontology/wikiPageWikiLink>)
}
LIMIT 1000000
```

```SQL
PREFIX dbo:  <http://dbpedia.org/ontology/>
PREFIX dbp:  <http://dbpedia.org/property/>
PREFIX dbr:  <http://dbpedia.org/resource/>

SELECT ?subject, ?relationship, ?object
WHERE {
  ?subject ?relationship ?object .
  ?subject rdf:type dbo:Film .
}
```

```SQL
PREFIX dbo:  <http://dbpedia.org/ontology/>
PREFIX dbp:  <http://dbpedia.org/property/>
PREFIX dbr:  <http://dbpedia.org/resource/>

SELECT ?subject
WHERE {
  ?subject rdf:type dbo:Film .
}
```