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→Accessing the shareable Database
'''extern:'''''directory'' open a sql-like database by loading an external module, a. la. rdb and ''multiaccess:''. This option would not be implemented in the initial release, but the ''extern:'' keyword would be reserved for future use.
Plain directory spec. For binary compatibility, the plain directory spec as the same as '''dbm:'''''directory'' unless overridden with the NSS_DEFAULT_DATABASE NSS_DEFAULT_DB_TYPE environment variable. Applications will not need to change for this release of NSS. (particularly unfriendly applications that want to tweak with the actual database file). Users can force older applications to share the database with the environment variable. The environment variable only affects non-tagged directories.
When accessing the '''dbm:''' and '''multiaccess:''' directories, external shared library will be loaded which knows how to handle these legacy databases. This allows us to move much of the current mapping code into this shared library.
