PREFIX : <http://example/>
SELECT ?x (count(?v) as ?n)
{
 ?x :p ?v .
}
GROUP BY ?x
HAVING (?n = 2 )


## PREFIX : <http://example/>
## PREFIX  n: <http://example/x#> 
## PREFIX  rdf:    <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
## PREFIX  rdfs:   <http://www.w3.org/2000/01/rdf-schema#>
## PREFIX  xsd:    <http://www.w3.org/2001/XMLSchema#>
## 
## SELECT *
## { 
##     ?x n:p ?z1 .
##     ?x n:q/n:p* ?z2.
##     ?x n:p ?z3 .
## ##     FILTER( true ) 
## ##     FILTER(?z1 > 2 )
## ##     FILTER(?z2 > 2 )
## ##     FILTER(?z3 > 2 )
## ##     FILTER(?z4 > 2 )
## }
## 
## 
## ## Parse testing
## ##    ?x n:a/n:a/n:a  ?a .
## ##    ?x n:a/(n:b|n:p) ?a . 
## ##    ?x n:a/n:b|n:p ?a . 
## ##    ?x (n:a/n:b)|n:p ?a . 
## ##    ?x :q ?z .
## ##  
## ##     ?x ^:p* ?w .
## ## 
## ##     ?x ^(:p*) ?w .
##