lt_sobj_id_t
lt_sobj_id_t id;
sobj_id_hash(lt_sobj_id_t *id)
sobj_id_equal(lt_sobj_id_t *a, lt_sobj_id_t *b)
lookup_sobj(lt_sobj_id_t *id)
lt_sobj_id_t lt_so_oid;