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It may be the case that SPARQL queries performed on the endpoint are known to match, sort, or filter on certain properties more often than others. In this case, the ontology may use tracker:domainIndex in the class definition:
# Make queries on ex:dateOfBirth faster ex:Mammal a rdfs:Class; rdfs:subclassOf ex:Animal; rdfs:comment "A mammal"; tracker:domainIndex ex:dateOfBirth.
Classes may define multiple domain indexes.