void atom_backend_enumerate_entries_set (AtomBackend *,
void (AtomCtx *, char ***,
AtomEntry ***, size_t *));
-void atom_backend_is_feed_set (AtomBackend *, int (AtomCtx *, AtomID *));
AtomEntry * atom_retrieve_entry (AtomCtx *, AtomID *);
void atom_enumerate_entries (AtomCtx *, char ***, AtomEntry ***, size_t *);
-int atom_is_feed (AtomCtx *, AtomID *);
AtomFeed * atom_retrieve_feed (AtomCtx *);
AtomBackend * atom_backend (AtomCtx *);
void atom_backend_set (AtomCtx *, AtomBackend *);