Major Description
Schema objects are defined by the protocol, except for Normalizers, SyntaxCheckers and Comparators. Those elements are critical to the server, and we should make them first class SchemaObjects too.
That mean we must define a description for them, as the other elements have.
Their handling will not differ from the other schema elements object, too (atm, they are treated as separated element, and their OIDs are not stored into the OidRegistry).