// Remove the attributeType from the oid/normalizer map
attributeTypeRegistry.removeMappingFor( attributeType );
// Unregister this AttributeType into the Descendant map
attributeTypeRegistry.unregisterDescendants( attributeType, attributeType.getSuperior() );
/**
* Remove the AT references (using and usedBy) :
* AT -> MR (for EQUALITY, ORDERING and SUBSTR)
* AT -> S