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