xmmsc_coll_t *c2 = xmmsc_coll_new(XMMS_COLLECTION_TYPE_EQUALS);
    xmmsc_coll_attribute_set(c2, "field", "artist");
    xmmsc_coll_attribute_set(c2, "value", "Jem");
    xmmsc_coll_add_operand(c2, xmmsc_coll_universe());