sparql rdf semantic-web dbpedia sparqlwrapper

How to get all inverse properties using SPARQL?

I need a SPARQL query to get all available inverse properties. exp (before, after, spouse, ... etc) i tried this, on specific domain (Person) :

SELECT
DISTINCT ?predicate
WHERE 

{
  ?subject a dbo:Person .
  ?object a dbo:Person . 
  ?subject ?predicate ?object .
  ?object ?predicate ?subject .
}

RESULT:

http://www.w3.org/2000/01/rdf-schema#seeAlso

http://www.w3.org/2002/07/owl#sameAs

http://www.w3.org/2002/07/owl#differentFrom

http://dbpedia.org/property/deathPlace

http://dbpedia.org/ontology/associatedBand

http://dbpedia.org/ontology/author

http://dbpedia.org/ontology/associatedMusicalArtist

http://dbpedia.org/ontology/field

http://dbpedia.org/ontology/governor

http://dbpedia.org/ontology/lastAppearance

http://dbpedia.org/ontology/managerClub

http://dbpedia.org/ontology/recordLabel

http://dbpedia.org/ontology/relation

http://dbpedia.org/ontology/related

http://dbpedia.org/ontology/relative

http://dbpedia.org/ontology/starring

http://dbpedia.org/property/p

http://dbpedia.org/property/title

http://purl.org/linguistics/gold/hypernym

Solution

Note that you're not asking for the inverse properties; you're asking for symmetric (or reciprocal, or reflective) properties -- where each subject/object pair is also described as an object/subject pair.

If you really want something closer to inverse, you might try something like --

SELECT DISTINCT ?predicate 
                ?reverse_predicate
WHERE 
  {
    ?subject a                  dbo:Person .
    ?object  a                  dbo:Person . 
    ?subject ?predicate         ?object .
    ?object  ?reverse_predicate ?subject .
  }
ORDER BY ?predicate ?reverse_predicate

-- but if you look at the results from that query, you'll notice that many "reflected" relationships are not expressed with properties that are actually the inverse of each other.

ex:child and ex:parent are probably easily understood as inverse -- but how about ex:sibling, ex:brother, ex:sister? Also note just how many "reflected" properties there are for, for instance, <http://dbpedia.org/ontology/child>!

Probably, describing why you need these, and how you plan to make use of them, will help others provide more relevant answers or other information...