void comps_objmrtree_unset(COMPS_ObjMRTree * rt, const char * key) {
    COMPS_HSList * subnodes;
    COMPS_HSListItem * it;
    COMPS_ObjMRTreeData * rtdata;
    unsigned int offset, len, x;
    char found, ended;
    COMPS_HSList * path;

    struct Relation {
        COMPS_HSList * parent_nodes;
        COMPS_HSListItem * child_it;
    } *relation;

    path = comps_hslist_create();
    comps_hslist_init(path, NULL, NULL, &free);

    len = strlen(key);
    offset = 0;
    subnodes = rt->subnodes;
    while (offset != len) {
        found = 0;
        for (it = subnodes->first; it != NULL; it=it->next) {
            if (((COMPS_ObjMRTreeData*)it->data)->key[0] == key[offset]) {
                found = 1;
                break;
            }
        }
        if (!found) {
            comps_hslist_destroy(&path);
            return;
        }
        rtdata = (COMPS_ObjMRTreeData*)it->data;

        for (x=1; ;x++) {
            ended=0;
            if (rtdata->key[x] == 0) ended += 1;
            if (x == len - offset) ended += 2;
            if (ended != 0) break;
            if (key[offset+x] != rtdata->key[x]) break;
        }
        if (ended == 3) {
            /* remove node from tree only if there's no descendant*/
            if (rtdata->subnodes->last == NULL) {
                comps_hslist_remove(subnodes, it);
                rt->len -= rtdata->data->len;
                comps_objmrtree_data_destroy(rtdata);
                free(it);
            }
            else {
                rt->len -= rtdata->data->len;
                comps_objlist_clear(rtdata->data);
                rtdata->is_leaf = 0;
            }

            if (path->last == NULL) {
                comps_hslist_destroy(&path);
                return;
            }
            rtdata = (COMPS_ObjMRTreeData*)
                     ((struct Relation*)path->last->data)->child_it->data;

            /*remove all predecessor of deleted node (recursive) with no childs*/
            while (rtdata->subnodes->last == NULL) {
                //printf("removing '%s'\n", rtdata->key);
                comps_objmrtree_data_destroy(rtdata);
                comps_hslist_remove(
                            ((struct Relation*)path->last->data)->parent_nodes,
                            ((struct Relation*)path->last->data)->child_it);
                free(((struct Relation*)path->last->data)->child_it);
                it = path->last;
                comps_hslist_remove(path, path->last);
                free(it);
                rtdata = (COMPS_ObjMRTreeData*)
                         ((struct Relation*)path->last->data)->child_it->data;
            }
            comps_hslist_destroy(&path);
            return;
        }
        else if (ended == 1) offset+=x;
        else {
            comps_hslist_destroy(&path);
            return;
        }
        if ((relation = malloc(sizeof(struct Relation))) == NULL) {
            comps_hslist_destroy(&path);
            return;
        }
        subnodes = ((COMPS_ObjMRTreeData*)it->data)->subnodes;
        relation->parent_nodes = subnodes;
        relation->child_it = it;
        comps_hslist_append(path, (void*)relation, 0);
    }
    comps_hslist_destroy(&path);
    return;
}