How to reverse lookup in sparql query?

@darrion.kuhn 

To perform a reverse lookup in a SPARQL query, you would typically use a property that links two resources in the opposite direction. Here's an example of how you can do a reverse lookup using the "rdfs:subClassOf" property in an RDF graph:

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PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX ex: <http://example.org/>

SELECT ?subclass ?superclass
WHERE {
  ?subclass rdfs:subClassOf ?superclass .
}

In this example, we are looking for all the subclasses and their corresponding superclasses using the "rdfs:subClassOf" property. The query will return all pairs of subclass and superclass in the RDF graph.

You can modify this query based on the specific properties and relationships in your RDF graph to perform reverse lookups for different types of relationships.