pub fn schema_summary(rete: &Rete) -> Vec<(String, String, String, u32)>Expand description
An ontology-aware coarse graph: instead of structural communities, group
entities by their rdf:type class and aggregate relations between classes.
Returns (subject_class, predicate, object_class, count) over the default
graph. Entities with no type are (untyped); literals are (literal).
rdf:type triples themselves define the classes and are not counted as
relations. This is the dataset’s effective schema with instance volumes.