SPARQL Return only IRIs/URIs as result

Question

In SPARQL how do I retrieve only IRIs (or URIs) as a result of a BGP?

Eg in

SELECT ?s ?o WHERE 
    {?s ?p ?o }
LIMIT 100

Return only those ?o that are IRIs

Answer 1

In SPARQL there exist the following tests

SPARQL tests: isIRI, isURI, isBlank, isLiteral, isNumeric, bound

isIRI , isURI : returns true if the term is an IRI or a URI

isBlank : returns true if the term is a blank node

isLiteral : returns true if the term is a literal

isNumeric : returns true if the term is a numeric value

Source: List of SPARQL Filter Functions (Dataworld tutorial)

Hence you can write

SELECT ?s ?o WHERE {
       ?s ?p ?o 
       FILTER(isIRI(?o)) 
} limit 100