Abstract: A method for mapping an X500 data model onto a relational database (RDB) comprises the steps of building object classes, each comprising a list of its attributes, building attributes, each comprising its type, building a static directory information tree (SDIT), comprising only static distinguished names (SDN) which are relative distinguished names (RDN) with variable values removed and mapping X500 data to the RDB by associating an X500 object class to an RDB table and associating an X500 attribute to an RDB table column and storing the name of the table column with the S500 attribute as an address pointing to the attribute.

Abstract: A method for mapping an X500 data model onto a relational database comprising the steps of: building object classes, each comprising a list of its attributes (8), building attributes (8), each comprising its type (9), building a static directory information tree, SDIT, comprising only static DN, SDN, that is DN comprising only static RDN, that is RDN with any variable value removed, mapping X500 data to RDB by associating an X500 object class to a RDB table 11 an X500 attribute (8) to a RDB table column (14) and storing the name (13) of said table column (14) with said X500 attribute (8), as an address pointing to said attribute (8).