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# Obtain the label of a given class (:class1).
SELECT DISTINCT ?c (STR(?l) AS ?lb)
WHERE {
?c a :class1 ;
<http://www.w3.org/2000/01/rdf-schema#label> ?l .
}
# Obtain a list of classes.
SELECT DISTINCT ?c
WHERE {
GRAPH :graph
{[] a ?c .}
}
# Count instances belonging to a given class (:class1).
SELECT (COUNT(?s) AS ?rc)
WHERE {
GRAPH :graph
{?s a :class1 .}
}
# Enumerate classes linked from a given class (:class1) and predicates that link instances of the given class and the target classes.
# below q1 to q3 are indentical to each other (I think)
### q1
SELECT ?p ?c (COUNT(?p) AS ?pc) {
?f a :class1 .
?t a ?c .
?f ?p ?t .
FILTER(?c != owl:Class)
} GROUP BY ?p ?c
### q2
SELECT ?p ?c (COUNT(?p) AS ?pc) {
?f a :class1 ;
?p [ a ?c ].
FILTER(!sameTerm(?c, owl:Class))
} GROUP BY ?p ?c
### q3
SELECT ?p ?c (COUNT(?p) AS ?pc) {
?f a :class1 ;
?p ?t ;
!rdf:type ?t .
?t a ?c .
} GROUP BY ?p ?c
# Enumerate all the predicates with their counts under the condition that their subject and object belong to :c1 and :c2, respectively.
SELECT ?p (COUNT(?p) AS ?rc)
WHERE {
GRAPH :graph {
?s ?p ?o .
?s a :c1 .
?o a :c2 .
}}
GROUP BY ?p
# Count triples whose subject and object belong to :c1 and a locally-undeclared class, respectively.
SELECT (COUNT(?s) AS ?rc)
WHERE {
GRAPH :graph {
?s ?p ?o .
?s a :c1 .
MINUS {?o a ?oc}
FILTER(!isLiteral(?o) && ?p != rdf:type)
}}
# Enumerate all the predicates with their counts under the condition that their subject and object belong to :c1 and a locally-undeclared class, respectively.
SELECT ?p (COUNT(?p) AS ?rc)
WHERE {
GRAPH :graph {
?s ?p ?o .
?s a :c1 .
MINUS {?o a ?oc}
FILTER(!isLiteral(?o) && ?p != rdf:type)
}}
GROUP BY ?p
# Count triples whose subject belongs to :c1 and whose object is literal.
SELECT (COUNT(?s) AS ?rc)
WHERE {
GRAPH :graph {
?s ?p ?o .
?s a :c1 .
FILTER(isLiteral(?o))
}}
# Enumerate all the predicates with their counts under the condition that their subject belongs to :c1 and their object is literal.
SELECT ?p (COUNT(?p) AS ?rc)
WHERE {
GRAPH :graph {
?s ?p ?o .
?s a :c1 .
FILTER(isLiteral(?o))
}}
GROUP BY ?p
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