| Name | Description | Type | Package | Framework |
| QuadDataTypeCountMapper | A mapper for counting data type usages within quads designed primarily for use in conjunction with NodeCountReducer | Class | mapred.org.apache.jena.hadoop.rdf.mapreduce.count.datatypes | Apache Jena |
| TripleDataTypeCountMapper | A mapper for counting data type usages within triples designed primarily for use in conjunction with NodeCountReducer | Class | mapred.org.apache.jena.hadoop.rdf.mapreduce.count.datatypes | Apache Jena |