This read-create object defines the type of match a Tuple entry performs, per the ClassTupleType enumeration; the description text appears copied from the neighboring offset-type field, but the object's own name and table context identify it as selecting the Tuple's match category. An admin building a QoS classification rule sets this to specify what kind of value the Tuple will compare against, such as an address, a protocol, or a custom offset-based value referenced elsewhere in the table. For example, when building a rule that needs to match a source IP address, the admin sets this field to the tuple type corresponding to address matching before filling in the actual address in rlQosTupleValue2.