How to get a list of all predicates in an RDF file or ontology using SPARQL code?

I want to know how to download/ extract a list of predicates from RDF/ ontology file using SPARQL?

For example, say we are talking about the "rdfs" URI. I want to get all properties (predicates) such as range, domain, type etc. to be listed. Is this possible? Or am I making a conceptual mistake here?

Solution

You can use the DISTINCT operator along with a SPARQL query that lists all the statements from a graph. You can also use ORDER BY to make long lists easier to browse.

SELECT DISTINCT ?p WHERE {
    ?s ?p ?o
}
ORDER BY ?p

If the graph you're querying against is an ontology, you might want to select all entities that have the rdf:Property type rather than the predicates in the graph.

When performing this request, make sure inference is enabled since most predicates are typed owl:ObjectProperty or owl:DatatypeProperty, which are subclasses of rdf:Property.

SELECT DISTINCT ?property WHERE {
    ?property a rdf:Property
}
ORDER BY ?property