| Name | Description | Type | Package | Framework |
| AbstractCharacteristicSetGeneratingReducer | Abstract reducer which takes in tuples grouped by some node and generating initial characteristic sets. | Class | mapred.org.apache.jena.hadoop.rdf.mapreduce.characteristics | Apache Jena |
| CharacteristicSetReducer | Class | mapred.org.apache.jena.hadoop.rdf.mapreduce.characteristics | Apache Jena | |
| QuadCharacteristicSetGeneratingReducer | Class | mapred.org.apache.jena.hadoop.rdf.mapreduce.characteristics | Apache Jena | |
| TripleCharacteristicSetGeneratingReducer | Class | mapred.org.apache.jena.hadoop.rdf.mapreduce.characteristics | Apache Jena | |