Matching Rule Use definitions map certain attribute types with a matching rule definition for extensible match filters. Extensible match filters allows clients to search using DN components, for example, (ou:dn:=engineering) or using an OID number, for example, (cn: Carter). The matching rule use attribute publishes those attribute types and matching rule combinations, which can be used in extensible match assertions.

Typically, you define a matching rule use that is not normally specified in the attribute type definition. You can create new matching rule uses from the existing schema definitions by adding a custom schema file in the <server-root>/config/schema directory.