Extensible match filters allow clients to search using distinguished name (DN) components, such as (ou:dn:=engineering), or using an OID number, such as (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 isn't 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.